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strojnjashka [21]
3 years ago
13

I really need some help. I'll mark best answer!

Mathematics
2 answers:
tresset_1 [31]3 years ago
7 0
Multiply top equation by -2, then add equations so b drops out....solve for a...plug in a to get b
ozzi3 years ago
5 0
Multiply the first equation by -2. This gives you a positive and a negative 8b, which can cancel out, leaving you with -16a = -40 and 5a = 62, which can be added together to make -11a = 22. Divide 22 by -11 to get a alone. A then equals -2. Plug -2 in for a in either equation. Solve for b, giving you -9. Plug these in again just to check if you'd like.

So, as a quick recap, just a is -2 and b is -9. Hope I helped!
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4 0
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TiliK225 [7]
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3 0
2 years ago
I have a flower vase with a 6 " diameter and is 12 " tall I want to fill it 2/3 of the way full how many cubic inches will I fil
RSB [31]

Answer:

72\pi\ in^{3}

Step-by-step explanation:

step 1

<em>Calculate the volume of the cylinder (flower vase)</em>

The volume is equal to

V=\pi r^{2}h

we have

r=6/2=3\ in -----> the radius is half the diameter

h=12\ in

substitute the values

V=\pi (3)^{2}(12)=108\pi\ in^{3} ------> exact value

step 2

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V=(2/3)108\pi=72\pi\ in^{3}

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Answer:

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Step-by-step explanation:

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