Answer:
The system of equations is x + y = 85 and 7/20x+2/5y=31To eliminate the x-variable from the equations, you can multiply the equation with the fractions by 20 and multiply the other equation by -7.B-She used 60 minutes for calling and 25 minutes for data.Step-by-step explanation:
It is always a good idea to start by defining variables in such a problem. Here, we can let x represent the number of calling minutes, and y represent the number of data minutes. The the total number of minutes used is ...
x + y = 85
The total of charges is the sum of the products of charge per minute and minutes used:
7/20x + 2/5y = 31.00
We can eliminate the x-variable in these equations by multiplying the first by -7 and the second by 20, then adding the result.
-7(x +y) +20(7/20x +2/5y) = -7(85) +20(31)
-7x -7y +7x +8y = -595 +620 . . . . eliminate parentheses
y = 25 . . . . . . . . simplify
Then the value of x is
x = 85 -y = 85 -25
x = 60
Answer:
The second, fourth and B option are correct.
Step-by-step explanation:
In order to solve this problem, we are going to define the following variables :
[tex]X:[/tex] ''Minutes she used her pay-as-you-go phone for a call''
[tex]Y:[/tex] ''Minutes of data she used''
Then, we are going to make a linear system of equations to find the values of [tex]X[/tex] and [tex]Y[/tex].
''This month, she used a total of 85 minutes'' ⇒
[tex]X+Y=85[/tex] (I)
(I) is the first equation of the system.
''The bill was $31'' ⇒
[tex](\frac{7}{20})X+(\frac{2}{5})Y=31[/tex] (II)
(II) is the second equation of the system.
The system of equations will be :
[tex]\left \{ {{X+Y=85} \atop {(\frac{7}{20})X+(\frac{2}{5})Y=31}} \right.[/tex]
The second option ''The system of equations is [tex]X+Y=85[/tex] and [tex](\frac{7}{20})X+(\frac{2}{5})Y=31[/tex] .'' is correct
Now, to solve the system, we can eliminate the x-variable from the equations by multiplying the equation with the fractions by 20 and multiplying the other equation by -7. Then, we can sum them to obtain the value of [tex]Y[/tex] :
[tex]X+Y=85[/tex] (I)
[tex](\frac{7}{20})X+(\frac{2}{5})Y=31[/tex] (II) ⇒
[tex](-7)X+(-7)Y=-595[/tex] (I)'
[tex]7X+8Y=620[/tex] (II)'
If we sum (I)' and (II)' ⇒
[tex](-7)X+(-7)Y+7X+8Y=-595+620[/tex] ⇒ [tex]Y=25[/tex]
If we replace this value of [tex]Y[/tex] in (I) ⇒
[tex]X+Y=85\\X+25=85\\X=60[/tex]
The fourth option ''To eliminate the x-varible from the equations, you can multiply the equation with the fractions by 20 and multiply the other equation by -7'' is correct.
With the solution of the system :
[tex]\left \{ {{X=60} \atop {Y=25}} \right.[/tex]
We answer that the option ''B-She used 60 minutes for calling and 25 minutes for data'' is correct.
x^4 - 1 =
A. (x+1)(x-1)(x^2+1)
B. ( X+1)^2(x-1)^2
C. (X+1)^3(X-1)^1
D. (x-1)^4
Answer:
A
Step-by-step explanation:
Given
[tex]x^{4}[/tex] - 1 ← a difference of squares which factors in general as
a² - b² = (a - b)(a + b)
here [tex]x^{4}[/tex] = (x²)² ⇒ a = x² and b = 1
[tex]x^{4}[/tex] - 1 = (x² - 1)(x² + 1)
x² - 1 ← is a difference of squares and factors as
x² - 1 = (x - 1)(x + 1), so
(x² - 1)(x² + 1) = (x - 1)(x + 1)(x² + 1), hence
[tex]x^{4}[/tex] - 1 = (x - 1)(x + 1)(x² + 1) → A
Answer:
A. (x + 1)(x - 1)(x^2 + 1).
Step-by-step explanation:
Using the difference of 2 squares (a^2 - b^2 = (a + b)(a - b) :
x^4 - 1 = (x^2 - 1)(x^2 + 1).
Now repeating the difference of 2 squares on x^2 - 1:
(x^2 - 1)(x^2 + 1 = (x + 1)(x - 1)(x^2 + 1).
The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) = 60t − 1.5t2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop?
Answer:
20 seconds
Step-by-step explanation:
Given:
Position of car = s(t) = 60t-1.5t^2
The speed is the change in position.
So,
[tex]Speed\ of\ car=\frac{ds}{dt} = \frac{d}{dt} (60t) -\frac{d}{dt} (1.5t^2)\\=60-2t(1.5)\\=60-3t[/tex]
When the car will stop, the speed will be zero.
[tex]60-3t=0\\3t=60\\t = \frac{60}{3}\\ t=20[/tex]
Therefore, the car will stop after 20 seconds of applying the break ..
Determine the next term in the sequence: 3, 6, 12, …
A: 15
B: 18
C: 24
D: 36
Answer:
C) 24
Step-by-step explanation:
The patter here is that you multiply the previous term by 2 to get the next term. So 3*2 is 6, 6*2 is 12, and 12*2 is 24.
The next term in the sequence: 3, 6, 12, … is 24. This can be obtained by finding the nth term and finding the 4th term.
What is a sequence ?A collection of items in a particular order and repetitions are allowed.
Arithmetic Sequence:a, a+d, a+2d, ..., a+(n-1)d, where a is the first term, d is the common difference and a+(n-1)d is the nth term.
Geometric Sequence:a, ar, ar¹, ..., arⁿ⁻¹, where a is the first term, r is the common ratio and arⁿ⁻¹ is the nth term.
What is the next term ?Given that, 3, 6, 12, …⇒this is a Geometric Sequence with nth term,
aₙ=3rⁿ⁻¹, n=1,2,3,...
From the given sequence, a₁=3, r=2
when n=1, a₁=3(r¹⁻¹)=3(r⁰)=3(2⁰)=3×1=3when n=2, a₂=3(r²⁻¹)=3(r¹)=3(2¹)=3×2=6when n=3, a₃=3(r³⁻¹)=3(r²)=3(2²)=3×4=12when n=4, a₄=3(r⁴⁻¹)=3(r³)=3(2³)=3×8=24Hence the next term in the sequence: 3, 6, 12, … is 24. Thus option C is the correct answer.
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Vineet solved a system of equations by substitution. In his work, he substituted an expression for one of the variables and solved for the value of the other. This resulted in the equation 7 = 9. What can Vineet conclude?
He can conclude that the system of equations has no solution since one equation in it always results with false equivalency.
Hope this helps.
r3t40
He can conclude that the system of equations is inconsistent, i.e. it has no solution.
Step-by-step explanation:We know that we get a no solution when we get a expression which is always false.
Here,
Vineet solved a system of equations by substitution.
In his work, he substituted an expression for one of the variables and solved for the value of the other.
This resulted in the equation 7 = 9.
which is a false identity.
since 7 can never be equal to 9.
Hence, the system of equations is inconsistent , it has no solution.
Write the point-slope form of the line satisfying the given conditions. Then use the point-slope form of the equation to write the slope-intercept form of the equation. Slopeequals6, passing through (negative 2,5)
[tex]\bf (\stackrel{x_1}{-2}~,~\stackrel{y_1}{5})~\hspace{10em} slope = m\implies 6 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-5=6[x-(-2)]\implies y-5=6(x+2) \\\\\\ y-5=6x+12\implies y=6x+17\qquad \impliedby \begin{array}{|c|ll} \cline{1-1} slope-intercept~form\\ \cline{1-1} \\ y=\underset{y-intercept}{\stackrel{slope\qquad }{\stackrel{\downarrow }{m}x+\underset{\uparrow }{b}}} \\\\ \cline{1-1} \end{array}[/tex]
Match the vocabulary word to its correct definition.
Answer:
1 -> f
2 -> e
3 -> d
4 -> a
5 -> c
6 -> g
7 -> b
Step-by-step explanation:
Let consider the options as a,b,c,d,e,f,g
1. Bell curve -> f
2. Data set -> e
3. Histogram -> d
4. Mean -> a
5. Normal distribution -> c
6. Standard deviation -> g
7. Variance -> b
The task is to match vocabulary words to their definitions, a common task in an English class. It involves comparing words with definitions and identifying matches. This helps students understand new words.
Explanation:Given that the task at hand is to match vocabulary words to their correct definitions, this is a task typically found in an English class. This activity involves comparing a list of words with a list of definitions, then identifying which definition corresponds to each word. For example, the word 'gratify' can be matched with the definition 'give (someone) pleasure or satisfaction'. This process helps students better understand and remember the meanings of new words.
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Choose the correct simplification of the expression (2x - 6)(3x2 - 3x - 6). (4 points) Select one: a. 6x3 - 24x2 + 6x + 36 b. 6x3 - 24x2 + 6x - 36 c. 6x3 + 24x2 - 6x + 36 d. 6x3 - 24x2 + 6x + 12
Answer:
a. 6x^3 - 24x^2 + 6x + 36
Step-by-step explanation:
These are expanded using the distributive property, which is also used for collecting terms.
(2x - 6)(3x2 - 3x - 6) = 2x(3x^2 - 3x - 6) - 6(3x^2 - 3x - 6)
= 6x^3 -6x^2 -12x -18x^2 +18x +36
= 6x^3 +(-6-18)x^2 +(-12 +18)x +36
= 6x^3 -24x^2 +6x +36 . . . . . . matches selection A
_____
Comment on strategy
For multiple-choice questions, it often works well to find a way to identify a viable answer with the minimum amount of work. Comparing these answer choices, you can see that determining the correct values of the x-term and the constant term will let you pick the right choice.
The constant term is easy, because it is simply the product of the constants (-6)(-6) = 36. This narrows the choices to A and C.
The x-term will be the sum of products of x-terms and constants:
2x(-6) +(-6)(-3x) = -6(2x-3x) = -6(-x) = 6x
This narrows the choices to A alone.
Given: 3x+52=13
Prove: x = 7
write a two column proof
The answer x = 7 is false here is why.
[tex]3x+52=13\Longrightarrow3x=-39[/tex]
This further simplifies to solution,
[tex]x=-\dfrac{39}{3}\Longrightarrow\boxed{x=-13}[/tex]
Hope this helps.
r3t40
Final answer:
The two-column proof format shows that the solution to the given equation 3x + 52 = 13 is x = -13, which contradicts the statement x = 7 to be proven. Either the given equation or the proof is incorrect as x = 7 cannot be derived from the equation provided.
Explanation:
Two Column Proof
When given the equation 3x + 52 = 13, we are asked to prove that x = 7. To do this, we can use a methodical approach in a two-column proof format where we list each step of the solution process alongside the reason for each step, as follows:
3x + 52 = 13: Given equation.
3x = 13 - 52: Subtract 52 from both sides.
3x = -39: Simplify.
x = -39 / 3: Divide both sides by 3.
x = -13: Simplify.
This results in x = -13, which contradicts the initial statement that we need to prove (x = 7). Therefore, either there is a mistake in the given equation or the proof is incorrect. Based on the provided information, x = 7 cannot be directly proven from the equation 3x + 52 = 13.
Anthony is saving for a Xbox one he currently has the $165 saved and earned $40 per week doing chores around the house if an Xbox cost 500+10% sales tax how long will it take for him to save that amount
Answer:
10 weeks
Step-by-step explanation:
Let w represent the number of weeks Anthony will be saving. Then he wants ...
165 + 40w = 500 +0.10×500
40w = 385 . . . . . subtract 165 and simplify
w = 9.625 . . . . . . divide by 40
It will take Anthony 9.625 ≈ 10 weeks to save that amount.
A curve passes through the point ????0, 5???? and has the property that the slope of the curve at every point P is twice the y-coordinate of P. What is the equation of the curve?
Answer:[tex]y=2x^2[/tex]
Step-by-step explanation:
Given Curve passes through [tex]\left ( 0,5\right )[/tex]
Also the slope of the curve at every point p is twice the Y-coordinate of p
Let the coordinate of p be[tex] \left ( x,y\right )[/tex]
Therefore
[tex]\frac{\mathrm{d} y}{\mathrm{d} x}=2y[/tex]
[tex]\frac{dy}{y}=2dx[/tex]
Integrating both sides
[tex]\int \frac{dy}{y}=\int 2dx[/tex]
[tex]\ln y=2x+c[/tex]
Substituting values
[tex]\ln 5=c[/tex]
[tex]\ln \frac{y}{5}=2x[/tex]
[tex]y=2x^2[/tex]
Mercury is 0.39 AU from the sun. What is its distance from the sun in kilometers?
Answer:
The distance between the sun and Mercury is 58 343 220 km.
Step-by-step explanation:
1 AU/149,598,000 kilometers = 0.39 AU/x
1x = (149,598,000)(0.39)
x = 58 343 220
For this case we have by definition that an Astronomical Unit (AU) equals 149,598,000 kilometers.
We propose a rule of three to find the distance of Mercury to the sun in kilometers.
1 AU -------------> 149,598,000 km
0.39 AU ---------> x
Where "x" represents the distance in kilometers:
[tex]x = \frac {0.39 * 149,598,000} {1}\\x = 58,343,220[/tex]
Answer:
58,343,220 km
It's going to be Lindsay's birthday soon, and her friends Martin, Sylvia, Tad, and Yvonne have contributed equal amounts of money to buy her a present. They have $25.00 to spend between them. Determine how much each contributed.
Aaron reads 9 books from the library each month for p months in a row. Write an expression to show how many books Aaron read in all. Then, find the number of books Aaron read if he read for 6 months.
Answer: 1) Each friend had contributed $6.25.
2)The expression to show how many books Aaron read in p months :
[tex]y=9p[/tex]
He reads 54 books in 6 months.
Step-by-step explanation:
1) Given : The total number of friends who contributed equal amounts of money to buy a present. : 4
The total amount they have = $25
Since all the friends contributed the same amount.
Thus , the amount each had contributed :
[tex]=\dfrac{\text{Amount collected}}{\text{Number of friends}}\\\\=\dfrac{25}{4}=6.25[/tex]
Hence, each friend had contributed $6.25.
2) Given : The number of books Aron reads each month = 9 books
Let the number of months be 'p'.
Then the expression to show how many books Aaron read in p months .
[tex]y=9p[/tex]
Then , the number of books Aaron read if he read for 6 months.
[tex]y=9(6)=54[/tex]
Hence, he reads 54 books in 6 months.
Matilda sits on her back porch for one hour every morning for a week and record the types and numbers of birds that viste her bird feeder what kind of study is this ?
Observational study.
------APEX
Answer:
d.Step-by-step explanation:
The choices for this question are
a. Double-blind study
b. Experiment
c. Sample survey
d. Observational study
The right answer would be d. Observational study, because this type of study is defined as an empirical and non-experimental research where all information is obtained by observation. When we apply this study, we try to find a cause-effect relation by observing the phenomenon as it naturally happens, that is, without interfering with the course of events like experimental investigations do.
So, in this case, Matilda is just observing, without altering anything that could influence the birds. She just sits observe and recover information, that's an observational study.
Therefore, the right answer is d.
Suppose you just received a shipment of six televisions. Three of the televisions are defective. If two televisions are randomly selected, compute the probability that both televisions work. What is the probability at least one of the two televisions does not work?
Answer:
.6094
Step-by-step explanation:
Consider the system of linear equations. 5x+10y=15 10x+3y=13 To use the linear combination method and addition to eliminate the x-terms, by which number should the first equation be multiplied?
A- -2
B- -1/2
C- 1/2
D- 2
Answer:
A: -2
Step-by-step explanation:
You want some factor k such that k(5x) +(10x) = 0. That is, 5k+10 = 0. The solution to this is k=-2, corresponding to selection A.
k = -2 for sure
I normally multiply 5x+10y=15 by -2 to cancel out the x's.
This is because you can only solve the problem if one of your variables is canceled out and then you solve!
Kathy distributes jelly beans among her friends. Alia gets 4^2 fewer jelly beans than Kelly, who gets 3^3 jelly beans. How many jelly beans does Alia get? A. 4^2 ? 3^3 B. 3^3 + 4^2 C. 4 ? 3^3 D. 3^3 ? 4^2 E. 3^2 ? 4^3
"Alia gets 4^2 fewer than Kelly, who gets 3^3."
So it's about a subtraction.
[tex]\boxed{3^3-4^2}[/tex]
Hope this helps.
r3t40
Answer:
D. 3^3 - 4^2
Step-by-step explanation:
4^2 fewer than 3^3 is ...
3^3 - 4^2 . . . . . matches choice D
The terminal side of θ passes through the point (−5,−6). What is the exact value of cosθ in simplified form?
5√61/61
−5√61/61
−6√61/61
6√61/61
Answer:
proof my answer is correct
Step-by-step explanation:
The exact value of cosθ in simplified form is -5√61 / 61.
What is Trigonometry?One area of mathematics known as trigonometry examines the relationship between the sides and angles of a right triangle. The relationship between sides and angles is defined for 6 trigonometric functions.
We have,
The terminal side of θ passes through the point (−5,−6).
Now, Hypotenuse
= √(-5)² + (-6)²
= √25+36
=√61
Using Trigonometry
cos θ = Adjacent side/ Hypotenuse
cos θ = -5/ √61
Now, rationalizing
cos θ = -5/√61 x √61/√61
cos θ = -5√61 / 61
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Wave Corporation began the current year with a retained earnings balance of $25,000. During the year, the company corrected an error made in the prior year, which was a failure to record depreciation expense of $5,000 on equipment. Also, during the current year, the company earned net income of $15,000 and declared cash dividends of $5,000. Compute the year-end retained earnings balance.
Answer:
$30,000.
Step-by-step explanation:
Wave Corporation began the current year with a retained earnings balance of $25,000.
Depreciation expense was of $5000
During the current year, the company earned net income of $15,000
Also gave cash dividends of $5,000.
So, year end retained earnings will be :
Year end retained balance = total net income minus net losses and dividends.
[tex]25000-5000+15000-5000=30000[/tex] dollars
The answer is $30,000.
If a cone-shaped water cup holds 23 cubic inches and has a radius of 1 inch, what is the height of the cup? Use 3.14 to for pi. Round your answer to the nearest hundredth. 6.76 inches 18.56 inches 21.97 inches 23.00 inches
Answer:
21.97 in
Step-by-step explanation:
Use the formula for the volume of a cone, fill in the given information, and solve for the height.
V = (1/3)πr²h
23 in³ = (1/3)(3.14)(1 in)²h . . . . . . . . with given numbers
3·23 in³/(3.14 in²) = h ≈ 21.97 in . . . . . divide by the coefficient of h
Answer:
21.97 inches
Step-by-step explanation:
If a cone-shaped water cup holds 23 cubic inches and has a radius of 1 inch, the height of the cup is 21.97 inches.
Round your answer to the nearest hundredth.
Danny is installing a fence around his rectangular yard. His yard is 20 feet long by 45 feet wide. If the fencing he picked out costs 25$ per foot, how much money will Danny spend on the fence?
Find the perimeter of the yard ( the distance around the yard).
A rectangle has two sides of each dimension.
The perimeter is 20 + 20 + 45 + 45 = 130 feet.
Now multiply the total feet by the cost per foot:
130 feet x 25 per foot = $3,250 total.
Danny needs to spend on his yard $3250 to fencing.
What is a rectangle?The rectangle is a geometrical figure in which opposite sides are equal.
The angle between any two consecutive sides will be 90 degrees.
Area of rectangle = length × width.
Perimeter of rectangle = 2( length + width).
Length of fence = Perimeter of his yard(rectangle)
Perimeter of rectangle = 2( length + width).
Perimeter of fence =2 ( 20 + 45 )
The perimeter of fence =130 foot.
Now
Cost = $25 per foot
So,
Cost of 130 feet at the rate of $25 per foot
⇒ 130 × 25 = $3250
Hence, Danny needs to spend on his yard $3250 to fencing.
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Please help on these questions about Slopes on Graphs !!!!
Answer:
a) {C, D}, {B, E}, A . . . . four possible equivalent answers (explanation below)
b) Line C shows a "directly proportional" relationship
Step-by-step explanation:
Slope is the ratio of "rise" (vertical change) to "run" (horizontal change). Positive changes are "up" and "right".
Line A -- has no vertical change, so its slope is 0.
Line B -- changes 1 unit vertically for each 4 units horizontally, so its slope is 1/4.
Line C -- changes 1 unit vertically for each 2 units horizontally, so its slope is 1/2.
Line D -- changes 1 unit vertically for each 2 units horizontally, so its slope is 1/2. This is the same slope as line C, so neither is greater than the other.
Line E -- changes 1 unit vertically for each 4 units horizontally, so its slope is 1/4. This is the same slope as line B, so neither is greater than the other.
If we use alphabetical order to rank equal slopes, then the slopes (greatest to least) are ...
C (1/2), D (1/2), B (1/4), E (1/4), A (0)
_____
A "directly proportional" relationship graphs as a straight line through the origin. The only line passing through the point where the x- and y-axes meet is line C.
Line C represents a proportional function.
[30 points] Help with volume! A circular swimming pool has a radius of 7 m and a depth of 1.4 meters. It is filled to the top with water. It develops a leak and loses 5 cubic meters of water every 2 hours. After how long would the water in the swimming pool be at a depth of 0.9 m?
use 3.14 for pi.
Volume of a cylinder pi × r squared × depth.
Round your answer to the nearest hours.
PLEASE give an explanation with your answer! A detailed answer will get Brainliest. :)
Answer:
Around 31 hours
Step-by-step explanation:
So since the formula for cylinder is pi × r squared × depth, you will get 215.51 cubic meters. When it's 0.9 m, it will be 138.54.
The pool has a leak and loses 5 cubic meters every 2 hours.
Subtract 5 from 215.51 until you get 140.51 when you can no longer subtract 5.
It will be 15 times. Which is 30 hours. Subtract 2.5 from 140.51 and you get around 138.01. Now that was an hour. 30+1= 31 hours
How to find the surface area of a regular pyramid?
Step-by-step explanation:
[tex]l \times w + l \sqrt{( \frac{w}{2}) ^{2} + {h}^{2} } + w \times \sqrt{( \frac{l}{2} )^{2} + {h}^{2} } [/tex]
L = length base
w = width base
h = height
Answer:
[tex]S=\dfrac{ns^2}{4}\left(\cot{\left(\dfrac{180^{\circ}}{n}\right)}+\sqrt{3}\right)[/tex]
Step-by-step explanation:
A "regular pyramid" is a pyramid whose base is a regular polygon and whose edges are all the same length. Thus each face is an equilateral triangle.
A hexagonal regular pyramid will look like a hexagonal pancake, as the vertical height of it will be zero. A regular pyramid with 7 or more faces cannot exist, because the apexes of the triangular faces cannot meet at a point.
__
For an edge length of "s", the area of each triangular face is (√3)/4×s². There are n of those faces, so the lateral area (LA) will be ...
LA = ns²(√3)/4
The area of the regular polygon base will be the product of half its perimeter and the length of its apothem (a). The apothem is ...
a = (s/2)cot(180°/n)
So, the area of the base (BA) is ...
BA = (1/2)(ns)(s/2)cot(180°/n) = ns²cot(180°/n)/4
The total surface area of the regular pyramid is then ...
S = BA + LA
S = (ns²/4)(cot(180°/n) +√3) . . . . for edge length s and n faces (3≤n≤5)
Please help show that the following are TRUE.
Answer:
see below
Step-by-step explanation:
The formula for the sum of an infinite geometric series with first term a1 and common ratio r (where |r| < 1) is ...
sum = a1/(1 -r)
Applying this to the given series, we get ...
a. sum = 5/(1 -3/4) = 5/(1/4) = 20
b. sum = d/(1 -1/t) = d/((t-1)/t) = dt/(t-1)
_____
The derivation of the above formula is in most texts on sequences and series. In general, you write an expression for the difference of the sum (S) and the product r·S. You find all terms of the series cancel except the first and last, and the last goes to zero in the limit, because r^∞ → 0 for |r| < 1. Hence you get ...
S -rS = a1
S = a1/(1 -r)
Julio uses 3/4 cups of honey to make a batch of granola bars. Julio used 7 1/2 cusp of honey when he made some granola bars yesterday.
Write an equation that models this situation, using x to represent the number of batches of granola bars julio made.
How many batches of gronola bars did julio make?
Please Show work
Answer:
[tex]8\frac{2}{8}[/tex]
Step-by-step explanation:
x = number of granola bars
[tex]\frac{3}{4} + 7\frac{1}{2} = \frac{6}{8} + 7\frac{4}{8} = 7\frac{10}{8} = 8\frac{2}{8}[/tex] = x[/tex]
Solve the equation
A kite is 85 feet high with 100 feet of string let out. What is the angle of elevation of the string with the ground? Please show all work.
Answer:
58°
Step-by-step explanation:
A right triangle can be drawn to model the geometry of the problem. The hypotenuse of the triangle is the length of the string, 100 ft. The side opposite the angle is the height of the kite above the ground, 85 ft.
The mnemonic SOH CAH TOA reminds you of the relationship between sides and angles.
Sin = Opposite/Hypotenuse
sin(α) = (85 ft)/(100 ft) = 0.85
The angle whose sine is 0.85 is found using the arcsine (inverse sine) function:
α = arcsin(0.85) ≈ 58.2°
The angle of elevation is about 58°.
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When using your calculator to find the values of inverse trig functions, make sure it is in degrees mode. Otherwise, you're likely to get the answer in radians (≈ 1.01599 radians).
What would be the steps for finding the equation for the function f(x) based on the graph (the blue line) and what would the equation be? Please include steps that are universal to finding the equation of any possible graphed function, as I really don't even know where to begin and would like to be able to solve problems like this on my own one day. Thanks! :)
Answer:
f(x) = -2|x-2| +4
Step-by-step explanation:
Step 1: recognize this as an inverted, scaled, and translated absolute value function.
Step 2: identify the scale factor as 2, because each section has a "rise" of 2 for each "run" of 1. The scale factor is -2 because the function is inverted (reflected across the x-axis).
Step 3: identify the vertex* as (2, 4).
Step 4: Use the scale factor and translation information to make the transformation ... (let abs(x) represent the absolute value function)
f(x) = (scale factor)×abs(x -horizontal shift) + (vertical shift)
f(x) = -2|x -2| +4
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* The vertex is an identifiable point on the graph of this function. Knowing how the vertex is translated tells you how the whole function is translated. In general, you want to use an identifiable point (a turning point, point of symmetry, extreme point, whatever) when you're trying to determine the translation. For some functions, like a line, there is no specific identifiable point, so determining any specific translation is difficult or impossible.
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Comment on writing functions from graphs
One of the reasons for studying different functions is so you can learn to recognize their shape, and associate a formula and certain properties with that shape.
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The attached graph shows the parent absolute value function in blue and the transformed function f(x) in red.
4. Find the value of sin 34°. Round to the nearest ten-thousandth.
O A 0.6745
B 0.8290
C 0.5291
D 0.5592
Answer:
Option D is correct.
Step-by-step explanation:
We need to find the value of sin 34°.
We can find the value by putting it in the calculator
sin 34° = 0.5592
So, Option D is correct.
Answer:option d is correct
Step-by-step explanation:
NEED HELP QUICK!!!!Charmaine is riding her bike. The distance she travels varies directly with the number of revolutions (turns) her wheels make. See the graph below.
(a) How many revolutions does Charmaine make per foot of distance traveled?
(b) What is the slope of the graph?
Answer:
Step-by-step explanation:
Circumference of the wheel = (pi)d = 45*3.14 = 141.3 inches
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Distance traveled in inches: 5*141.3 = 706.5 inches
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Distance traveled in feet: 706.5/12 = 58.875 feet
Its in the picture below
a: 1% decay
b: 10% decay
c: 9% growth
d: 90% growth
Answer:
b: 10% decay
Step-by-step explanation:
Expressed as a percentage change, the growth is usually the value of the base of the exponential function after 1 has been subtracted. That result is expressed as a percent:
0.9 - 1 = -0.10 = -10% . . . . . 10% decay
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The "t/12" exponent means this is the decay that is experienced over 12 units of time. This might be the annual decay, where t is expressed in months, for example.