-4x - 2y = -2
X - 2y = 9
What is the result of subtracting the second equation from the first

Answer:

  yes

Step-by-step explanation:

The average weight of the three bags is ...

  (55 +51 +48)/3 = 154/3 = 51 1/3 . . . pounds

By removing 3 2/3 pounds of sand from the heaviest bag, adding 1/3 pound to the middle-weight bag, and the remaining 3 1/3 pounds to the lightest bag, Ortega can make all of the bags weigh the same: 51 1/3 pounds.

Answer:

No

Step-by-step explanation:

For it to be a triangle c² = a² + b²

The longest side is c (9)

and 81 ≠ 49 + 16

Can I get brainliest

Answer:

No

Step-by-step explanation:

Since it might be a right triangle, we can test the values using the Pythagorean theorem.

[tex]a^2+b^2=c^2[/tex]

a and b are the legs, and c is the hypotenuse.

We know that 4 and 7 are the legs, or a and b. This is because they are two smaller sides.  We know that 9 is the hypotenuse, or c. This is because it is the longest side.

[tex]4^2+7^2=8^2[/tex]

Solve the exponents

[tex]16+49=81[/tex]

65=81

[tex]65 \neq 81[/tex]

Since 65 does not equal 81, this cannot be a right triangle

Answer:

-0.555

Step-by-step explanation:

The terminal point of the vector in this problem is

(-2,-3)

So, it is in the 3rd quadrant.

We want to find the angle [tex]\theta[/tex] that gives the direction of this vector.

We can write the components of the vector along the x- and y- direction as:

[tex]v_x = -2\\v_y = -3[/tex]

The tangent of the angle will be equal to the ratio between the y-component and the x-component, so:

[tex]tan \theta = \frac{v_y}{v_x}=\frac{-3}{-2}=1.5\\\theta=tan^{-1}(1.5)=56.3^{\circ}[/tex]

However, since we are in the 3rd quadrant, the actual angle is:

[tex]\theta=180^{\circ} + 56.3^{\circ} = 236.3^{\circ}[/tex]

So now we can find the cosine of the angle, which will be negative:

[tex]cos \theta = cos(236.3^{\circ})=-0.555[/tex]

Answer: The probability of being chosen by a wand made of holly or a wand made of dragon scale core is 0.4 or 40%

Step-by-step explanation: What we have are probabilities of two events. The first is the probability that Harry Potter is chosen by a wand made of Holly which is P(A). The other event is the probability that Harry is chosen by a wand with a dragon scale which is P(B).

In other to calculate P(A), there is a total of four possibilities, (that is holly, elm, maple and wenge). Therefore, the probability is derived as;

P(A) = Number of required outcomes/Number of all possible outcomes

P(A) = 1/4 or (0.25)

To calculate P(B), there is a total of five possibilities (that is phoenix feather, unicorn hair, dragon scale, raven feather and thestral tail). Therefore the probability is derived as;

P(B) = Number of required outcomes/Number of all possible outcomes

P(B) = 1/5 or (0.20)

However, the question requires the probability of P(A or B).

First we derive the probability of being chosen by a wand made of holly AND one made of a dragon scale core. In other words we shall calculate the probability of P(A and B) which is derived as;

P(A and B) = P(A) x P(B)

P(A and ) = 1/4 x 1/5

P(A and B) = 1/20 (0.05)

The probability of P(A or B) can now be calculated as follows;

P(A or B) = P(A) + P(B) - P(A and B)

P(A or B) = (0.25 +0.20) - 0.05

P(A or B) = 0.45 - 0.05

P(A or B) = 0.40

Therefore the probability that Harry Potter is chosen by a wand made of Holly or a wand with Dragon scale core is 0.4 or 40%

Answer: P( A or B) = 2/5

Step-by-step explanation:

Answer:

1. 23.55 in

2. 102.36 mm

Step-by-step explanation:

First, the circumference of a circle is written as: [tex]C=\pi d=2\pi r[/tex], where either equivalence works and d = diameter and r = radius.

1. We know that d = 7.5, so we just plug this into the equation:

[tex]C=\pi *7.5=3.14*7.5=23.55[/tex]

Thus, the circumference is 23.55 inches.

2. We know here that r = 16.3, so we can plug this into the other equivalence:

[tex]C=2*\pi *16.3=2*3.14*16.3=102.364[/tex] ≈ [tex]102.36[/tex]

Thus, the circumference is 102.36 millimeters.

Hope this helps!

Answer:

1. 23.55 inches

2. 102.36 millimeters

Step-by-step explanation:

1. Circumference = pi × d

3.14 × 7.5

= 23.55 in

2. Circumference = 2pi × r

2 × 3.15 × 16.3 = 102.364 mm

Answer: True

Explanation: To add mixed numbers, first add the fractions.

So here, we have 4/9 + 6/9 which is 10/9.

Then add the whole numbers.

So we have 1 + 2 which is 3.

So our answer is 3 and 10/9.

But notice, that since 10/9 is an improper fraction,

our answer is not in lowest terms.

10/9 can be rewritten as the mixed number 1 and 1/9.

So 3 and 10/9 is the same as 3 + 1 and 1/9 which is 4 and 1/9.

Since 4 and 1/9 is in lowest terms, this is our final answer.

So we can say that 1 and 4/9 + 2 and 6/9 is 4 and 1/9.

Answer:

  A)  33 3/4°

Step-by-step explanation:

The supplement of an angle is the difference between 180° and the angle measure:

  supplement of 146 1/4° = 180° -(146 1/4)°

  = (180° -146°) -1/4° = 34° -1/4°

  = 33 3/4° . . . . supplement of the given angle

Answer:

Option 2 is correct

Since only 18 is less than 23 and greater than 7, therefore the possible length of third sides is 18 cm and option 2 is correct.

Answer:

130.43 cm³

Step-by-step explanation:

To find the difference between the volumes of the balls, we must first find the volumes of the balls. To find the volume of each ball, we must first determine their shape. We understand that both balls are spherical.

The volume V of a sphere wit radius r is given as

V = 4/3 πr³

where r is the result when the diameter of the sphere is divided by 2.

Hence the radius of the Golf ball

= 4.3cm/2

= 2.15cm

radius of the tennis ball

= 6.9cm/2

= 3.45cm

The difference between the volumes of the two balls

= 4/3 π (3.45³ - 2.15³)

= 130.43 cm³

Answer:

this is to much work for me to do.

Step-by-step explanation:

Final answer:

Option D, with scores of 100, 87, 94, 94, and 81, yields the highest average when calculated using the mean, making it the best choice for the student seeking the highest test average.

Explanation:

The question asks which set of test scores will give the highest average if calculated using the mean. To find the answer, we calculate the mean of each set of scores:

A: (95+82+76+95+96)/5 = 88.8

B: (79+80+91+83+80)/5 = 82.6

C: (65+84+75+74+65)/5 = 72.6

D: (100+87+94+94+81)/5 = 91.2

Among the options, option D has the highest mean.

Therefore, the student with test scores of 100, 87, 94, 94, and 81 will have the highest average when using the mean to calculate.

Answer:

-p - 30

Step-by-step explanation:

4p−5(p+6)

Distribute:

=4p+(−5)(p)+(−5)(6)

=4p+−5p+−30

Combine Like Terms

=4p+−5p+−30

=(4p+−5p)+(−30)

=−p+−30

=−p−30

80 feet per second

Step-by-step explanation:

just divide the amount he fell by the amount of time it took so you would take 400/5 and get the answer

Answer:

80

Step-by-step explanation:

If it took him 5 seconds to drop 400 feet then you have to divide it by 5 to determine the rate he can drop a certain amount of feet per second.

Answer:

10 combinations

Step-by-step explanation:

What we have to do is calculate the number of combinations of 3 in 5.

The formula for the combinations is:

nCr = n!/r!(n-r)!

in this case n = 5 and r = 3

replacing

5C3 = 5!/3!(5-3)! = 5!/(3!*2!)

5C3 = 10

So there are 10 combinations in which Erika can enjoy the books on her trip

Answer:

The number of different combinations of 3 books that Erika can take on a trip if she has 5 books is 10

Step-by-step explanation:

Here we have the formula for combination given as follows;

[tex]\binom{n}{r} = \frac{n!}{r!(n-r)!}[/tex]

Where n is the number of set  elements = 5 and

r = Number of subset elements = 3

Therefore, plugging the values, we have;

[tex]\binom{5}{3} = \frac{5!}{3!(5-3)!} = \frac{120}{6(2)} = 10[/tex]

Therefore, the number of different combinations of 3 books that Erika can take on a trip if she has 5 books = 10.

Answer:

The answer to your question is   b = 11.31 cm  or   8[tex]\sqrt{2}[/tex] cm

Step-by-step explanation:

Data

hypotenuse = 18 cm

one leg = 14 cm

second leg = ?

Process

1.- Use the Pythagorean Theorem to solve this problem

                 c² = a² + b²

c = hypotenuse

a = longer leg

b= shorter leg

2.- Substitution

                        18² = 14² + b²

-Solve for b

                         b² = 18² - 14²

-Simplify

                         b² = 324 - 196

                         b² = 128

-Find the prime factors of 128

                          128   2

                            64  2

                             32  2

                             16  2

                              8  2

                              4  2

                              2  2

                               1

          128 = 2⁶2¹                                    

-Result

                         b = 11.31   or   8[tex]\sqrt{2}[/tex]

Answer:

21.32 Cm

Step-by-step explanation:

Add up the centiminer

Answer:

1 is c

2 is b

3 is d

4 is a

Step-by-step explanation:

Open circle is 'less than' or 'greater than'.

Closed (shaded) circle is 'less than or equal to' or 'greater than or equal to'.

Answer: Hannah blew 1 bubble

Step-by-step explanation:

Mean * number of gum chewers= total bubbles

4*4=16

Let’s add up the numbers of bubbles that we do know.

4+5+6=15

16-15=1

Hannah blew 1 bubble

The number of bubbles Hannah blew can be expressed as 1

The study of variables and the formula manipulation principles is known as algebra. Its roots lie in the computation methods of ancient Babylonia, but now it is a mode of thinking that permeates practically all branches of mathematics.

Let number of bubbles Hannah blew =x

Then we can set up the equation as

[tex]\frac{1}{4} (4+5+6+x)=4[/tex]

15+x=16

x=16-15

x=1

Learn more about number at

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Answer:

15 and 16

Step-by-step explanation:   To get simplified form, you add the numbers in parentheses together. (2+9+4)= 15 and (3+1+4+8)=16

For problem 1. 2+9=11  11+4=15

For problem 2. 3+1=4    4+4=8   8+8=16

Hopefully this helped, and please add me as brainliest.

Final answer:

The simplified forms of the expressions (2 + 9 + 4) and (3 + 1 + 4 + 8) are 15 and 16, respectively. The placement of parentheses affects the outcome of mathematical operations significantly, and careful evaluation following the order of operations is essential for accurate simplification, particularly when nested expressions are involved.

Explanation:

The question requires matching each mathematical expression with its simplified form. Let's simplify the given expressions:

(2 + 9 + 4) simplifies to 2 + 9 + 4 = 15.

(3 + 1 + 4 + 8) simplifies to 3 + 1 + 4 + 8 = 16.

Now, to address your example concerning the importance of the placement of parentheses, consider the expression 2 + (3 x 5). If the parentheses are around (2 + 3), the result is different than if the parentheses are around (3 x 5). Without any parentheses, the order of operations dictates that multiplication is done before addition. Hence:

(2 + 3) x 5 = 5 x 5 = 25 (since addition within parentheses is done first, followed by multiplication).

2 + (3 x 5) = 2 + 15 = 17 (since multiplication within parentheses is done first, followed by addition).

The width of the computer monitor is 22 inches

What is a Rectangle?

In a Rectangle

The diagonal equals the square root of the width squared plus the height squared

Given data ,

Let the Width of the rectangle be W

Diagonal of the rectangle = 27 inches

Height of the rectangle = 15 inches

D² = L² + W²

W² = D² - L²

W² = ( 27 )² - ( 15 )²

     = 729 - 225

     = 504

Therefore , Width W = √504

                                  ≈ 22.45 inches

                                  ≈ 22 inches

Hence , the width of the computer monitor is 22 inches

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As supply rises, prices decrease.

And The average rate of change describes how much a quantity changes as prices increases

As supply decreases, prices increase. It seems logical but I'm not 100% positive on the last one. I know the first 2 are right.

The statements that are true as they relate to supply and demand are: as supply rises, prices generally decrease; as demand decreases, prices generally increase; as supply decreases, prices increase.

Supply and demand are fundamental concepts in economics. The law of supply states that as supply increases, prices generally decrease. This is because when there is a higher quantity supplied, producers compete to sell their products, leading to lower prices. On the other hand, the law of demand states that as demand decreases, prices generally decrease. When there is lower demand for a product, sellers may lower prices to attract more buyers.

Additionally, the statement that as supply decreases, prices increase is also true. When the quantity supplied decreases, the scarcity of the product can drive up prices as buyers are willing to pay more for limited supply. The average rate of change refers to how much a quantity changes as the price increases. It is not directly related to supply and demand dynamics, but rather focuses on the relationship between quantity and price. As demand rises, the price of a product generally increases. This is because as more people want to buy a product, sellers can charge higher prices since there is higher demand.

Answer:

true

Step-by-step explanation:

Answer:

1633.3 meters

Step-by-step explanation:

-Given the angle of depression is 31°, and the plane's height above the ground is 1400m.

-We use the Law of Sines to determine the distance between the plane and the rock.

-The angle of elevation from the rock to the plane is(corresponds to the plane's altitude):

[tex]\angle elevation=90-31\\=51\textdegree[/tex]

#Now, using Sine Law;

[tex]\frac{a}{Sin \A}=\frac{b}{Sin \ B}\\\\\\\frac{1400}{Sin \ 59}=\frac{d}{Sin \ 90}\\\\\\\\=1633.287\approx 1633.3\ m[/tex]

Hence, the direct distance between the plane and the rock is 1633.3 meters

Answer:

s=-8

Step-by-step explanation:

Answer:

3/10

Step-by-step explanation:

Answer:

Grows, Factor of 2

Step-by-step explanation:

The relationship between the elapsed time, t, in years, since Takumi started studying his tree, and the total  number of its branches, N(t), is modeled by the function:

[tex]N(t) = 63. 2^t[/tex]

For illustration, let us take the growth for the first three years after he started studying the number of branches.

[tex]When \:t=1, N(1) = 63. 2^1=126\\When \:t=2, N(2) = 63. 2^2=252\\When \:t=3, N(3) = 63. 2^3=504\\504\div 252=252\div 126=2[/tex]

We notice that for each subsequent year, the number of branches doubles.

Therefore:

Every year, the number of branches  grows by a factor of 2.

Answer:

10 feet

Step-by-step explanation:

The height of the ball after it hits the floor and rebound is defined by the recursive formula:

[tex]a_n = 0.85a_{n-1}[/tex]

This is an example of a geometric sequence in which the next term is gotten by multiplication of the previous term by 0.85.

If the ball is dropped from a height of 10 feet, the first term is 10.

Its Initial height, [tex]a_1=10 \:feet[/tex]

Answer:

A and C

Step-by-step explanation:

I did the assignment

false because it is formed wrong

Final answer:

The equation y = x^3 - 4 is not a linear equation because it contains a cubic term (x^3), which means the graph is a curve, not a straight line. Therefore, the correct answer is false.

Explanation:

The equation y = x3 − 4 is not a linear equation. A linear equation is one in which every term is either a constant or the product of a constant and the first power of a variable. In the given equation, the term x3 indicates that it is a cubic term because the value of x is raised to the power of three, suggesting that the graph of this equation would be a curve, not a straight line. Therefore, the correct answer is false.

Linear equations have the general form y = mx + b, where 'm' is the slope and 'b' is the y-intercept. Examples of linear equations include y = −3x, y = 0.2 + 0.74x, and y = −9.4 − 2x, which can all be graphed as straight lines. In contrast, an equation like y = x3 − 4 does not fit this form and therefore is not considered linear.

Answer:

0.4444444

Step-by-step explanation:

2/3 x 2/3 = 0.4444 repeating!

Hope this helps!

The answer would be D since it forms a straight line along the x-axis