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3 years ago

Solve using substitution. x + 3y = -13 5x + 7y = -9

1 answer:

6 0

From equation 1
x = -3y-13
plug this into equation 2:-
5(-3y-13) + 7y = -9
-15y - 65 + 7y = -9
-8y = 56
y = -7
Now plug y = 7 into equation 1
x - 21 = -13
x = -13 + 21 = 8

solution is x = 8 , y = -7

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2 years ago

A family drives 412 miles in 10 hours? What is their approximate rate of speed in miles per hour?(not 1/10 of an hour just 10 ho

kogti [31]

Answer:

41.2 miles per hour

Step-by-step explanation:

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3 years ago

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Find the value of x if ∡A and ∡B are supplementary angles.

Elanso [62]

Answer:

$x = 30.5$

Step-by-step explanation:

Two angles are supplementary when they add up to 180°.

So we know that:

$C + D = 180$

Supplanting we get:

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$8x-44-20 = 180$

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Then we send 64 to the other side adding:

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2 years ago

What number is 35% of 80?

Wittaler [7]

What number is 35% of 80?

35/80

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3 years ago

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Lisa [10]

Answer:

The answer is

$\frac{1372}{3} \pi \: {cm}^{3}$

Step-by-step explanation:

First you have to find the radius of sphere by dividing diameter by 2 :

$radius = diameter \div 2$

Let diameter = 14,

$radius = 14 \div 2$

$radius = 7 \: cm$

Next you have to use the volume of sphere formula :

$v = \frac{4}{3} \times \pi \times {r}^{3}$

Let r = 7,

$v = \frac{4}{3} \times \pi \times {7}^{3}$

$v = \frac{4}{3} \times \pi \times 343$

$v = \frac{1372}{3} \pi \: {cm}^{3}$

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3 years ago