Answer:
x=-4/5
Step-by-step explanation:
8/20=x/-2
simplify 8/20 into 2/5
2/5=x/-2
cross product
5*x=-2*2
5x=-4
x=-4/5
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Answer:

Step-by-step explanation:
Since perimeter,
and we know that P=2(l+w) then 
The length will be 
Now 
5+3a = 3-2a
So
5a = -2
a=-2/5=-0.4
To find a volume of a cylinder we use the following formula:

Plug in the values:

Take the square:

Multiply the numbers: