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Sergeeva-Olga [200]
2 years ago
15

PLEASE HELP FAST!!!!!

Mathematics
1 answer:
stellarik [79]2 years ago
8 0

Answer:

The solution of the system of equations be:

x=8,\:y=4

Hence, option C is true.

Step-by-step explanation:

Given the system of equations

\begin{bmatrix}4x+7y=60\\ -4x+7y=-4\end{bmatrix}

adding both the equations

-4x+7y=-4

+

\underline{4x+7y=60}

14y=56

so the system of equations becomes

\begin{bmatrix}4x+7y=60\\ 14y=56\end{bmatrix}

solve 14y for y

14y=56

Divide both sides by 14

\frac{14y}{14}=\frac{56}{14}

Simplify

y=4

\mathrm{For\:}4x+7y=60\mathrm{\:plug\:in\:}y=4

4x+7\cdot \:4=60

4x+28=60

Subtract 28 from both sides

4x+28-28=60-28

Simplify

4x=32

Divide both sides by 4

\frac{4x}{4}=\frac{32}{4}

x=8

Therefore, the solution of the system of equations be:

x=8,\:y=4

Hence, option C is true.

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Im so confused. :/ Anyone?
ArbitrLikvidat [17]
First one = 9x3=27

Second one 12x9=108

3rd one = 3x4=12
 
Idk what that last one is
7 0
3 years ago
Coffee company wants to make sure that their coffee is being served at the right temperature. If it is too hot, the customers co
andrey2020 [161]

Answer:

The average temperature of coffee in the sample, which is 70.2.

Step-by-step explanation:

The population is all the costumers. The company has determined that they want the average coffee temperature to be 65 degrees C. So, 65 degrees C is the average of the population.

The sample is the 20 orders. The mean \mu of the sample is 70.2C(That is, the mean of the 20 orders0. So, the correct answer is:

The average temperature of coffee in the sample, which is 70.2.

3 0
3 years ago
A baker made 35 pastries in 3 1/2 hours. how many pastries dod the baker make in one hour?
Sophie [7]

Answer:

10 pastries

Step-by-step explanation:

To find how many they made in 1 hour, divide 35 by 3 1/2

35/3.5

= 10

So, he made 10 pastries in 1 hour

6 0
3 years ago
Sonya wants to sew ribbon along each side of a square pillow.
Eduardwww [97]

We are given area of the ribbon = 144 square inches.

We know formula for side of a square = \sqrt{Area \ of \ a \ square }.

Plugging value of area in the formula, we get

Side of the square = \sqrt{144}

= 12 inches.

Sonya wants to sew ribbon along each side of a square pillow.

So, we need to find the perimeter of the square pillow.

<h3>Perimeter = 4 × side = 4 × 12 = 48 inches.</h3><h3>Therefore, she buy 48 inches of ribbon to have the exact amount that she needs.</h3>
5 0
3 years ago
liam had $250 then he and his classmates bought a present for their teacher, evenly splitting the $p cost among the 24 of them.
Delvig [45]

Answer:

$10

Step-by-step explanation

Liam has $10 left for himself. Simply divide $240 by the 24 kids and you get $10 as your total. Thsi is what I could get as the answer since the price of the gift was'nt included.

4 0
3 years ago
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