Answer:
10
Step-by-step explanation:
Each term is the sum of the two after it:
a_n = a_n+1 + a_n+2
The next term is:
a₄ = a₅ + a₆
31 = 21 + a₆
a₆ = 10
There are 4 different methods you could use to solve a quadratic equation that would depending upon the actual equation. They are: - factoring the equation - taking the square root of both sides - completing the square - using the quadratic formula In the two equations that are listed below, describe which method would be the most appropriate to determine a solution. Reference the parts of the equation to justify your response. (You do not have to solve the equation. Some words/phrases to consider using in your response would be:
- factor
- FOIL Method
- Zero-Product Property
- Standard Form
- quadratic expression
- quadratic equations
- coefficient
- perfect square
Part A: x^2 + 6x + 8 = 0
Part B: x^2 + 6x - 11 = 0
Answer:
Part A: x^2 + 6x + 8 = 0 use the factoring the equation method
Part A: x^2 + 6x + 8 = 0 use the quadratic formula
Step-by-step explanation:
Part A;
The equation is x^2 + 6x + 8 = 0 , looking at this quadratic expression, you notice it is written in a quadratic equation standard form of ax^2+bx+c=0. Additionally, you notice that can find what multiplied to get the quadratic equation,factor.You can identify two numbers that multiply to get ac and add to give b.In this question;
a=1,b=6,c=8
ac=8
The numbers are 4 and 2. Factoring the equation method will give;
x²+6x+8=0
x²+4x+2x+8=0
x(x+4)+2(x+4)=0
(x+2)+(x+4)=x²+6x+8
x+2=0, x=-2 and x+4=0, x=-4
Part B
The quadratic equation is ;
x²+6x-11=0
You notice that there are no factors that multiply direct to get the quadratic equation like in part 1. When you observe, a=1, b=6 and c=-11
ac=1×-11=-11 and b=6 .You notice there are no factors that multiply to give -11 and add to get 6, hence the factorizing the equation method can not be used.However, you can apply the quadratic formula that requires coefficients. You have a=1, b=c and c=-11 as the coefficients to use in the quadratic formula.
Answer:
Part A - use the factor method
Part B - use the quadratic equation
Step-by-step explanation:
Thinking process:
Let's look at the two parts in the problem:
Part A: x^2 + 6x + 8 = 0
This is a quadratic equation. Now, the product of the first and last term produces 8x². This product is a common multiple of 4 x and 2 x. These numbers can be added to get the middle term: 6x. Hence the equation can be solved by factorization.
Part B: x^2 + 6x - 11 = 0
Part B is also a quadratic equation. This equation can be analysed as follows:
The product of the first and last product gives -22x². Two factors are possibe: -11x and 2x or -2x and 11 x. These factors wjhen added or subtracted do not give the middle term (6x). Hence factorization will not work.
The best way to solve the equation is to use the quadratic formula:
[tex]x= \frac{-b+/-\sqrt{b^{2}-4ac } }{2a}[/tex]
Which expression represents the number rewritten in a + bi form?
Answer:
3 + 2i
Step-by-step explanation:
3 + √(-4) = 3 + i√4 = 3 + 2i
Recall that √(-1) = i
a hose fills a hot tub at a rate of 4.39 gallons per minute. How many hours will it take to fill a 280-gallon hot tub?
[tex]\bf \begin{array}{ccll} gallons&minutes\\ \cline{1-2} 4.39&1\\ 280&x \end{array}\implies \cfrac{4.39}{280}=\cfrac{1}{x}\implies 4.39x=280\implies x=\cfrac{280}{4.39} \\\\\\ x\approx \stackrel{\textit{minutes}}{63.78}~\hspace{7em}63.78 ~~\begin{matrix} min \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~ \cdot \cfrac{hr}{60 ~~\begin{matrix} min \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~ } \implies \boxed{1.063~hr}[/tex]
Do you guys know the answer for number 5
Answer:
60 inches squared
Step-by-step explanation:
The formula for the area of a triangle is as follows:
[tex]A=\frac{1}{2} bh[/tex]
Where A=area, b=base, and h=height.
Plug in 15 for your base and 8 for your height and solve.
[tex]A=\frac{1}{2} (15)(8)\\A=7.5(8)\\A=60[/tex]
Answer:
B) 60 squared inches
Step-by-step explanation:
To find the area of a triangle you have to use this equation:
A = 1/2 b*h
Now plug in the numbers,
A = 1/2 15*8
15*8 = 120
1/2 of 120 = 60
A = 60
The area of this triangle is 60 squared inches.
Consider the relationship 3r+2t=18
A. write the relationship as a function r=f(t)
B. Evaluate f(-3)
C. solve f(t)= 2
Answer and Explanation:
Given : Consider the relationship [tex]3r+2t=18[/tex]
To find :
A. Write the relationship as a function r=f(t)
B. Evaluate f(-3)
C. Solve f(t)= 2
Solution :
A) To write the relationship as function r=f(t) we separate the r,
[tex]3r+2t=18[/tex]
Subtract 2t both side,
[tex]3r=18-2t[/tex]
Divide by 3 both side,
[tex]r=\frac{18-2t}{3}[/tex]
The function is [tex]f(t)=\frac{18-2t}{3}[/tex]
B) To evaluate f(-3) put t=-3
[tex]f(-3)=\frac{18-2(-3)}{3}[/tex]
[tex]f(-3)=\frac{18+6}{3}[/tex]
[tex]f(-3)=\frac{24}{3}[/tex]
[tex]f(-3)=8[/tex]
C) Solve for f(t)=2
[tex]\frac{18-2t}{3}=2[/tex]
[tex]18-2t=6[/tex]
[tex]2t=12[/tex]
[tex]t=\frac{12}{2}[/tex]
[tex]t=6[/tex]
The value of f(-3), to write the relationship as a function (r = f(t)) and to solve the (f(t) = 2) expression, arithmetic operations can be use. Refer the below calculation for better understanding.
Given :
3r + 2t = 18
A) 3r = 18 - 2t
[tex]r = 6-\dfrac{2t}{3}[/tex] ---- (1)
where, [tex]\rm f(t)=6-\dfrac{2t}{3}[/tex] ----- (2)
B) [tex]r = 6-\dfrac{2t}{3}[/tex]
Given that f(-3) imply that t = -3. So from equation (2) we get
f(-3) = 8
C) Given that f(t) = 2. So from equation (2) we get,
[tex]2 = 6 -\dfrac{2t}{3}[/tex]
2t = 12
t = 6
The value of f(-3), to write the relationship as a function (r = f(t)) and to solve the (f(t) = 2) expression, arithmetic operations can be use.
For more information, refer to the link given below:
https://brainly.com/question/21114745
Which of these situations can be represented by the opposite of 10?
You climb up 10 flights of stairs
You walk down 10 flights of stairs
The temperature rises 10°F
A plant grows 10 inches taller
Choose the correct answer below
O A. You climb up 10 flights of stairs.
OB. You walk down 10 flights of stairs.
OC. The temperature rises 10°F.
OD. A plant grows 10 inches taller.
B. You walk down 10 flights of stairs
The situation that can be represented by the opposite of 10 is B. You walk down 10 flights of stairs. The concept of 'opposite' here refers to the negative version of a number, which, in this case, would be -10. When you climb up 10 flights of stairs, that's a positive movement upward, analogous to a positive 10. However, walking down 10 flights is the opposite direction, corresponding to -10. Similarly, a temperature rise or a plant growing represents an increase, not the opposite of 10.
On the first day of vacation, you read one-quarter of a novel. On the second day, you read half of the remaining pages. On the third day, you read the last 123 pages of the novel.
(a) How many pages does the novel have?
pages
(b) How many pages did you read by the end of the second day?
pages
Answer:
328 pages for the novel
123 pages for the second day
Step-by-step explanation:
Let the number of pages of the novel = x
Raw Equation
(1/4)x + 1/2 (3/4)x + 123 = x
Solution
(1/4)x + (3/8)x+ 123 = x
Change the fractions to common denominators.
(2/8)x + (3/8)x + 123 = x
Add the fractions.
(2/8 + 3/8)x + 123 = x
Subtract (5/8)x from both sides.
(5/8)x + 123 = x
(5/8)x- (5/8)x + 123 = x - (5/8)x
Multiply both sides by 8
123 = (3/8)x
123 * 8 = 3x
Divide by 3
984 = 3x
984/3 = 3x / 3
328 = x
===================
At the end of the second day, she read 3/8 * 328 = 123 pages.
The novel has 328 pages. By the end of the second day, the student had read 205 pages of the novel.
Explanation:The student's schoolwork question can be addressed by setting up and solving algebraic equations. Let's denote the total number of pages in the novel as x. On the first day, one-quarter of the novel is read, which is x/4 pages. So, there are 3x/4 pages remaining. On the second day, half of the remaining pages are read, which is (1/2) × (3x/4) = 3x/8 pages. On the third day, the student reads the last 123 pages, which were all the pages that were left. Therefore, the equation to solve for x is:
x - (x/4 + 3x/8) = 123
We can solve this equation to find out the total number of pages in the novel:
First, let's find a common denominator for the fractions. It is 8.
8x/8 - (2x/8 + 3x/8) = 123
8x/8 - 5x/8 = 123
3x/8 = 123
Let's multiply both sides of the equation by 8/3 to solve for x.
x = 123 × (8/3)
x = 328
The novel has 328 pages.
To find out how many pages were read by the end of the second day, we add the amount read on the first and second days:
(x/4) + (3x/8) = (2x/8) + (3x/8) = 5x/8
5x/8 when x = 328 is:
(5 × 328)/8 = 205
By the end of the second day, 205 pages were read.
Suppose you make a conjecture that your dog only eats dog food A. A valid counterexample is that last night he ate dog food.
True or False
Answer:
False
Step-by-step explanation:
A counterexample goes against what you said in the conjecture. An example of a counterexample in this case would be that your dog ate a burger, which is not dog food, last night.
8^3*8^-5*8^y=1/8^2, what is the value of y in the product of powers below?
For this case we have that by definition of multiplication of powers of the same base, the same base is placed and the exponents are added:
[tex]a ^ n * a ^ m = a ^ {n + m}[/tex]
So, we can rewrite the given expression as:
[tex]8 ^ {3-5 + y} = \frac {1} {8 ^ 2}\\8 ^ {- 2 + y} = \frac {1} {8 ^ 2}[/tex]
So, if [tex]y = 0[/tex]:
[tex]8 ^ {- 2} = \frac {1} {8 ^ 2}\\\frac {1} {8 ^ 2} = \frac {1} {8 ^ 2}[/tex]
Equality is met!
Answer:
[tex]y = 0[/tex]
Answer:
Value of y=0
Step-by-step explanation:
We need to solve
[tex]8^3*8^{-5}*8^y=1/8^2[/tex]
We know that 1/a^2 = a^-2
[tex]8^3*8^{-5}*8^y=8^{-2}[/tex]
[tex]8^y=\frac{8^{-2}}{8^3*8^{-5}}\\8^y=\frac{8^{-2}}{8^{3-5}}\\8^y=\frac{8^{-2}}{8^{-2}}\\8^y=1[/tex]
Taking ln on both sides
[tex]ln(8^y)=ln(1)\\yln(8)=ln(1)\\y= ln(1)/ln(8)\\We\,\,know\,that\,\,ln(1) =0\\y=0[/tex]
So, value of y=0
The cost function for Judy’s new clothing store where she sells t-shirts is c=$11.50n + 925. What will Judy’s total cost for this month be if she sells 32 t-shirts this month?
A. $925
B. $1293
C. $368
D. $1475
(Apex)
Answer:
The correct option is Option B. $1293
Step-by-step explanation:
It is given that,the cost function for Judy’s new clothing store where she sells t-shirts is c=$11.50n + 925. She sells 32 t-shirts this month
To find the total cost for this month
cost for n shirt , c=$11.50n + 925
Cost for 32 shirts = 11.50 * 32 + 925
= 368 + 925
= 1293
Therefore the total cost = $1293
The correct answer is option B. $1293
which is equivalent to......... algebra II engenuity
Answer:
Answer is C
Step-by-step explanation:
The root is placed in the denominator section, and the exponent is placed in the numerator section. it is a fraction because you are not using the entire exponent, you will only be using part of it as the other part of the exponent is negated by the X
For this case we have that by properties of roots and powers it is fulfilled that:
[tex]\sqrt [n] {a ^ m} = a ^ {\frac {m} {n}}[/tex]
So, if we have the following expression:
[tex]\sqrt [3] {8 ^ x}[/tex]
According to the given definition, we can rewrite it as:
[tex]8 ^ {\frac {x} {3}}[/tex]
ANswer:
[tex]8 ^ {\frac {x} {3}}[/tex]
Option C
A man is four times as older as his son. In four years time he will be three times as old. What are their ages now?
Answer:
The son is 8 years old
The father is 32 years old
Step-by-step explanation:
Let the man age be x
Let the son age = y
Right now the man is four times as older as his son = x=4y
In four years time he will be three times as old. ⇒x+4 =3(y+4)
Now substitute the value x=4y in x+4=3(y+4)
x+4=3(y+4)
4y+4=3(y+4)
4y+4=3y+12
Combine the like terms:
4y-3y =12-4
y=8
If the son is 8 years old than;
x=4y
x=4(8)
x=32
Father will be 32 years old....
Answer:
Present age of son: 8 years.
Present age of father: 32 years.
Step-by-step explanation:
Let x represent present age of the son and y represent present age of father.
We have been given that a man is four times as older as his son. 4 times of age of son would be [tex]4x[/tex].
We can represent this information in an equation as:
[tex]y=4x[/tex]
We are also told that in four years time he will be three times as old.
Age of father in 4 years would be [tex]y+4[/tex].
We can represent this information in an equation as:
[tex]y+4=3(x+4)[/tex]
Upon substituting [tex]y=4x[/tex] in 2nd equation, we will get:
[tex]4x+4=3(x+4)[/tex]
[tex]4x+4=3x+12[/tex]
[tex]4x+4-4=3x+12-4[/tex]
[tex]4x=3x+8[/tex]
[tex]4x-3x=3x-3x+8[/tex]
[tex]x=8[/tex]
Therefore, the present age of son is 8 years.
Upon substituting [tex]x=8[/tex] in equation [tex]y=4x[/tex], we will get:
[tex]y=4x\Rightarrow 4(8)=32[/tex]
Therefore, the present age of father is 32 years.
PLEASE! HELP!!!!!!!!!!!
Answer:
Look at the picture
Hope it helps ;)
Spaceship Earth, a spherical attraction at Walt Disney worlds epcot center, has a diameter of 50 meters. Find the surface area of the structure. (JUSTIFY)
Answer:
The surface area of the structure is [tex]SA=2,500\pi\ m^{2}[/tex]
Step-by-step explanation:
we know that
The surface area of a sphere is equal to
[tex]SA=4\pi r^{2}[/tex]
In this problem we have
[tex]r=50/2=25\ m[/tex] -----The radius is half the diameter
substitute
[tex]SA=4\pi (25)^{2}[/tex]
[tex]SA=2,500\pi\ m^{2}[/tex]
simplify this expression
4^8 / 4^4
A. 2
B. 16
C. 64
D. 256
Answer:
[tex]\displaystyle 256[/tex]
Step-by-step explanation:
PEMDAS
P-parenthesis, E-exponent, M-multiply, D-divide, A-add, and S-subtracting.
Exponent rule: [tex]4^8^-^4[/tex]
Subtract by the exponent from left to right.
[tex]\displaystyle 8-4=4[/tex]
[tex]\displaystyle 4^4=4*4*4*4=256[/tex]
256 is the correct answer.
determine the divisibilty of the following 6501
Answer:
Here is a complete list of numbers that 6501 is divisible by:
1, 3, 11, 33, 197, 591, 2167, 6501
Step-by-step explanation:
I hope that was the answer you were looking for have a nice day :p
The number 6501 is not divisible by common divisors like 2, 3, 4, etc., and is in fact a prime number.
To determine the divisibility of the number 6501, we examine the number against known divisibility rules. However, unlike numbers like 4, 12, and 11, which have easy-to-apply divisibility rules, 6501 does not have an obvious rule that we can apply. So, we have to actually perform the division or use a calculator if we are trying to determine its divisibility by numbers other than 1 and itself.
For example:
The number 6501 is divisible by 1 and 6501 (since all numbers are divisible by themselves and 1).
To check for divisibility by other numbers, use division (for example: 6501 ÷ 2 is not an integer, so it's not divisible by 2).
We can conclude that 6501 is a prime number because other than 1 and 6501 itself, there are no other numbers that divide it evenly, indicating no divisors that give a whole number as the result.
I need help with this problem. TIA
Answer:
The correct answer is B⊂A.
Step-by-step explanation:
The sets are:
A={x|x is a polygon}
B={x|x is a triangle}
According to the given sets Option 2 is correct:
The correct option is B⊂A.. We will read it as B is a subset of A.
The reason is that the Set A contains polygon and Set B contains triangle. A triangle is also a simplest form of polygon having 3 sides and 3 angles but a polygon has many other types also. Like hexagon, pentagon, quadrilateral etc. All the triangles are included in the set of polygon.
Thus the correct answer is B⊂A....
when planning for a party one caterer recommends the amount or meat be at least 2 pounds less than 1/3 the total number of guests. which graph represents this scenario?
Answer:
Let x be the number of guest and y be the quantity of meat,
According to the question,
[tex]y\geq \frac{x}{3}-2[/tex]
Since, the related equation of the above inequality,
[tex]y=\frac{x}{3}-2[/tex]
Having x-intercept = (6,0),
y-intercept = (0,-2)
Also,'≥' shows the solid line,
Now, 0 ≥ 0/3 - 2 ( true )
Hence, the shaded region of above inequality will contain the origin,
Therefore, by the above information we can plot the graph of the inequality ( shown below ).
Answer:
Its the 4th graph.
Step-by-step explanation:
29 POINTS! ANSWER ASAP PLEASE. Which statements about the dilation are true? Check all that apply. (multiple choice question) (image provided below)
A. The center of dilation is point C
B. It is a reduction
C. It is an enlargement
D. The scale factor is 2.5
E. The scale factor is 2/5
Answer:
A. The center of dilation is point C.
B. It is a reduction.
E. The scale factor is 2/5.
Step-by-step explanation:
The center is shown as C. You can see this from the line segments they drew through C, the image, and the pre-image.
The pre-image is the image before the dialation. The pre-image here is XYZ.
The image is the image after dialation. The image is X'Y'Z'.
If you look at the pre-image XYZ and then it's image X'Y'Z', ask yourself the image get smaller or larger. To me I see a larger triangle being reduce to a smaller triangle so this is a reduction.
The scale factor cannot be bigger than 1 because the image shrunk so D is definitely not a possibility.
E. is a possibility but let's actually find the scale factor to see.
We can calculate [tex]\frac{CX'}{CX}[/tex] or [tex]\frac{CY'}{CY}[/tex] or [tex]\frac{CZ'}{CZ}[/tex] to find out what the scale factor is.
[tex]\frac{CX'}{CX}=\frac{2}{5}[/tex]
[tex]\frac{CZ'}{CZ}=\frac{3}{7.5}=\frac{2}{5}[/tex].
The scale factor is 2/5.
Answer:
A, The center of dilation is point C.
B, It is a reduction.
and E, The scale factor is 2/5.
Step-by-step explanation:
a baseball diamond is actually a square with 90 foot sides. If a number tries to steal second base. how far must the catcher, at home plate thrown to get the number out
Answer:
The catcher will have to throw roughly 127 feet from home to second base.
Step-by-step explanation:
We have to use the Pythagorean Theorem. This gives us the third side length if we know the other two side lengths.
a² + b² = c²
90² + 90² = c²
8100 + 8100 = c²
16200 = c²
[tex]\sqrt{16200}[/tex] = [tex]\sqrt{c^2}[/tex]
c = 127.28 ft
The length of a rectangle is three times its width, and its area is 9 cm2
. Find the
dimensions of the rectangle.
Answer:
3√3 = l
√3 = w
Step-by-step explanation:
l = 3w
9 = 3w[w] ↷
9 = 3w² [Divide by 3]
3 = w² [Take the square root]
√3 = w [plug this back into the top equation to get a length of 3√3]
[3√3][√3] = 9 [Area]
I am joyous to assist you anytime.
Can someone show me how to do the problem ? If I take 8 pills a week, how many months is that?
Answer:
32
Step-by-step explanation:
I assume you want to find the pills per month? You know that you take 8 pills per week, and there are 4 weeks in a month. So:
8 pills/week × (4 week / month) = 32 pills/month
the figure (3,12,9,3) contains only horizontal and vertical lines. Calculate its perimeter.
Answer:
30 square units
Step-by-step explananation:
First of all we need to know the formula to finding the perimeter of a rectangle which is:
P = 2 x L(Length) + 2 x h(Height)
12 and 3 are apart by 12 - 3
12 - 3 = 9
Then, we subtract 9 from 3 ( :
9 - 3 = 6)
To get 6 as our answer.
6 will be the width and 9 will be the length.
Now we solve for the perimeter by plugging in our values into our formula:
P = 2(9) + 2(6)
P = 18 + 12
P = 30 square units
Mrs. Agustin has 3 coils of wire that are 32 m. 48 m, and 64 m long, respectively
She cut the wires such that the wires have the same lengths possible. What wa
the maximum possible length of each cut of wire?I
[tex]\displaystyle\\\text{Decompose numbers into prime factors.}\\\\32=2^5\\\\48=2^4\times3\\\\64=2^6\\\\\text{greatest common divisor (gcd)~}~=2^4=\boxed{\bf16 m}\\\\\boxed{\text{\bf The maximum possible length of each wire cut is 16 m.}}[/tex]
The maximum possible length for each cut of wire that Mrs. Agustin can make from the 32m, 48m, and 64m wire coils is 16m.
Explanation:In this problem, Mrs. Agustin is aiming to cut three different lengths of wires into equal parts. Therefore, the maximum possible length of each cut of wire can be calculated by finding the greatest common divisor (GCD) of the lengths of the three wires. The lengths of the wire coils are 32 m, 48 m, and 64 m. The GCD of these numbers is 16 m.
Thus, the maximum possible length of each cut wire would be 16 m.
Learn more about Greatest Common Divisor here:https://brainly.com/question/23270841
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How much more snow fell in February 1889 than November 1888?
1)8.4 inches
2)11.4 inches
3)8.1 inches
4)5.4 inches
Answer:
Step-by-step explanation:
i believe it is 4.
assuming feburary it snowed about 8.5 inches and in november it is at about the 3 in line you would subtract to get about 5.5 inches
Answer:
4) 5.4 inches
Step-by-step explanation:
5.4 inches of snow fell in February 1889 than November 1888.
According to the graph:
Feb '89: 8.5 inches
Nov '88: 3 inches
8.5 - 3 = 5.5 or 5.4.
if x^2 +x-12 is a factor of x^3+ax^2-10x-b then find the values of a and b
Answer:
a=3
b=24
Step-by-step explanation:
If [tex]x^2+x-12[/tex] is a factor of [tex]x^3+ax^2-10x-b[/tex], then the factors of [tex]x^2+x-12[/tex] must also be factors of [tex]x^3+ax^2-10x-b[/tex].
So what are the factors of [tex]x^2+x-12[/tex]? Well the cool thing here is the coefficient of [tex]x^2[tex] is 1 so all we have to look for are two numbers that multiply to be -12 and add to be positive 1 which in this case is 4 and -3.
-12=4(-3) while 1=4+(-3).
So the factored form of [tex]x^2+x-12[/tex] is [tex](x+4)(x-3)[/tex].
The zeros of [tex]x^2+x-12[/tex] are therefore x=-4 and x=3. We know those are zeros of [tex]x^2+x-12[/tex] by the factor theorem.
So x=-4 and x=3 are also zeros of [tex]x^3+ax^2-10x-b[/tex] because we were told that [tex]x^2+x-12[/tex] was a factor of it.
This means that when we plug in -4, the result will be 0. It also means when we plug in 3, the result will be 0.
Let's do that.
[tex](-4)^3+a(-4)^2-10(-4)-b=0[/tex] Equation 1.
[tex](3)^3+a(3)^2-10(3)-b=0[/tex] Equation 2.
Let's simplify Equation 1 a little bit:
[tex](-4)^3+a(-4)^2-10(-4)-b=0[/tex]
[tex]-64+16a+40-b=0[/tex]
[tex]-24+16a-b=0[/tex]
[tex]16a-b=24[/tex]
Let's simplify Equation 2 a little bit:
[tex](3)^3+a(3)^2-10(3)-b=0[/tex]
[tex]27+9a-30-b=0[/tex]
[tex]-3+9a-b=0[/tex]
[tex]9a-b=3[/tex]
So we have a system of equations to solve:
16a-b=24
9a-b=3
---------- This is setup for elimination because the b's are the same. Let's subtract the equations.
16a-b=24
9a-b= 3
------------------Subtracting now!
7a =21
Divide both sides by 7:
a =3
Now use one the equations with a=3 to find b.
How about 9a-b=3 with a=3.
So plug in 3 for a.
9a-b=3
9(3)-b=3
27-b=3
Subtract 27 on both sides:
-b=-24
Multiply both sides by -1:
b=24
So a=3 and b=24
cos pi/4 cos pi/6= 1/2(___pi/12+cos 5pi/12) fill in the blank
Answer:
[tex]\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{\pi}{12})+\cos(\frac{5\pi}{12}))[/tex]
So the blank is cos.
Step-by-step explanation:
There is an identity for this:
[tex]\cos(a)\cos(b)=\frac{1}{2}(\cos(a+b)+\cos(a-b))[/tex]
Let's see if this is fit by your left hand and right hand side:
So [tex]a=\frac{\pi}{4}[/tex] while [tex]b=\frac{pi}{6}[/tex].
Let's plug these in to the identity above:
[tex]\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{\pi}{4}+\frac{\pi}{6})+\cos(\frac{\pi}{4}-\frac{\pi}{6}))[/tex]
Ok, we definitely have the left hand sides are the same.
Let's see if the right hand sides are the same.
Before we move on let's see if we can find the sum and difference of [tex]\frac{\pi}{4}[/tex] and [tex]\frac{\pi}{6}[/tex].
We will need a common denominator. How about 12? 12 works because 4 and 6 go into 12. That is 4(3)=12 and 6(2)=12.
[tex]\frac{\pi}{4}+\frac{\pi}{6}=\frac{3\pi}{12}+\frac{2\pi}{12}=\frac{5\pi}{12}[/tex].
[tex]\frac{\pi}{4}-\frac{\pi}{6}=\frac{3\pi}{12}-\frac{2\pi}{12}=\frac{\pi}{12}[/tex].
Let's go back to our identity now:
[tex]\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{\pi}{4}+\frac{\pi}{6})+\cos(\frac{\pi}{4}-\frac{\pi}{6}))[/tex]
[tex]\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{5\pi}{12})+\cos(\frac{\pi}{12}))[/tex]
We can rearrange the right hand side inside the ( ) using commutative property of addition:
[tex]\cos(\frac{\pi}{4})\cos(\frac{\pi}{6})=\frac{1}{2}(\cos(\frac{\pi}{12})+\cos(\frac{5\pi}{12}))[/tex]
So comparing my left hand side to their left hand side we see that the blank should be cos.
This is a trigonometric equation requiring the use of sum-to-product identities. By applying the identity and simplifying, the result is: cos(pi/4)cos(pi/6) = 1/2(cos pi/12 + cos 5pi/12). The blank should be filled by a '+' sign.
Explanation:The question refers to a trigonometric identity equation in the field of mathematics. To solve it, we have to use the principle of the sum-to-product identities from trigonometry.
Let's use the identity: cos(A)cos(B) = 1/2 [cos(A - B) + cos(A + B)]. In this case, A = pi/4 and B = pi/6.
Therefore, cos(pi/4)cos(pi/6) = 1/2 [cos(pi/4 - pi/6) + cos(pi/4 + pi/6)].
Simplified further cos(pi/24) + cos(5pi/12).
So, the blank should be filled with a '+', making the equation cos(pi/4)cos(pi/6) = 1/2(cos pi/12 + cos 5pi/12).
Learn more about trigonometry here:https://brainly.com/question/31896723
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The circle below is centered at the point (4,3) and has a radius of length 5.
What is its equation?
A. (x-4)2 + (y + 3)2 =
52
B. (x-4)2 + (y - 3)2 = 52
C. (x-3)2 + (y - 3)2 =
52
D. (x+4)2 + (y-3)2 =
25
Answer:
B. (x-4)^2 + (y - 3)^2 = 5^2
Step-by-step explanation:
The equation for a circle is given by
(x-h)^2 + (y-k) ^2 = r^2
where (h,k) is the center and r is the radius
We have a center of (4,3) and a radius of 5
(x-4)^2 + (y-3) ^2 = 5^2
4.
Vivian has some sweets. If she shares the sweets among 4 friends, she will have
3 sweets left. If she shares the sweets among 5 friends, she will have
4 sweets left. If she shares the sweets among 9 friends, she will have
8 sweets left. What is the smallest possible number of sweets she has?
What is the solution to this question?
Answer:
least possible number of sweets = lowest common multiple of 5,6 & 10 - 2
-I hope this helps! I got it figured out until near like the very end.-
-Please mark as brainliest!- Thanks!
Final answer:
The smallest number of sweets that satisfies the condition of being left with certain remainders when shared with different numbers of friends is found using modular equations, with the solution being 59 sweets.
Explanation:
To solve the problem presented for Vivian and her sweets, we will use the concept of simultaneous congruences from number theory.
Vivian's sweets when divided by 4 leave a remainder of 3, when divided by 5 leave a remainder of 4, and when divided by 9 leave a remainder of 8. This situation translates to the following set of modular equations:
Sweets ≡ 3 (mod 4)Sweets ≡ 4 (mod 5)Sweets ≡ 8 (mod 9)The smallest number that satisfies all these conditions is known as the least common multiple plus the respective remainders.
With the aid of the Chinese Remainder Theorem, we can conclude that the smallest number of sweets that satisfies all conditions is 59. This is the least number of sweets Vivian can have and still meet the conditions given for sharing among her friends.
QUESTION - What information is true when calculating the surface area of a pyramid? Check all that apply.
A) A pyramid has only one base.
B) The base of a pyramid is a polygon.
C) If the altitude of a right pyramid and the apothem of the base are known, then the Pythagorean theorem can be used to find its slant height.
D) The slant height is always the same length as the base of the pyramid.
E) The lateral faces of a pyramid are rectangles.
F) The slant height is used to calculate the lateral area.
Step-by-step explanation:
Definition:
A pyramid is a polyhedron formed by connecting a one polygonal base and a point, called the apex. Each base edge and apex form a triangle.
A) A pyramid has only one base. TRUE (definition)
(look at any photo with the pyramid)
B) The base of a pyramid is a polygon. TRUE (definition)
(look at any photo with the pyramid)
C) If the altitude of a right pyramid and the apothem of the base are known, then the Pythagorean theorem can be used to find its slant height. TRUE
(look at the picture)
D) The slant height is always the same length as the base of the pyramid.
FALSE
E) The lateral faces of a pyramid are rectangles. FALSE (definition)
(the lateral faces of a pyramid always are triangles)
F) The slant height is used to calculate the lateral area. TRUE
(the lateral faces of a pyramid are triangles. The formula of an area of a triangle is A = (bh)/2. Where b - base of triangle, h - height of triangle)
Answer:
A: pyramid has only one base.
B: The base of a pyramid is a polygon.
C: If the altitude of a right pyramid and the apothem of the base are known, then the Pythagorean theorem can be used to find its slant height.
F: The slant height is used to calculate the lateral area.