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2 years ago

-4m + 2n = 6 -4m + n = 8 solve for and x and y steps

1 answer:

5 0

I am doing this problem assuming that you mean to solve for m and n as x and y do not exist in this system of equations.

-4m+2n=6

-4m+n=8

We can see that the coefficient of x for both equations are -4; therefore, elimination with subtraction is possible.

First equation - second equation

n=-2

Then substitude back in to solve for m

-4m+(-2)=8

4m=10

m=5/2

Therefore the answer is

n= - 2

m= 5/2

I hope this helped and if you have any questions please ask.

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Square A is a scaled version of square B. The dimensions of square A are three times the dimensions of square B. The area of squ

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Answer:

The side of square A is 30 cm.

Step-by-step explanation:

Given that,

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The area of square A is 900 sq cm.

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Let the side of square B is b. So,

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We know that, the area of square is side². So,

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Hence, the side of square A is 30 cm.

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3 years ago

A barrel of oil was filled at a constant rate of 7.5 gal/min. the barrel had 10 gallons before filling began. write an equation

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Assuming that :

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3 years ago

Please help me with this

horrorfan [7]

Answer:

$\dfrac{4000\pi}{3}$ ft³

Step-by-step explanation:

First, let's figure out how to get the volume of a sphere from its surface area. If r is the radius of our sphere, then

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The formula for a sphere's volume is $V=\frac{4}{3}\pi r^3$

So to get from area to volume, we have to divide the area by 3 and then multiply it by r. Mathematically:

$V=\frac{A}{3}r$

Before we solve for V though, we need to find the radius of our sphere. Thankfully, we're given the surface area - $400\pi$ ft² - so we can use the area formula to find that radius: