What is the area of a rectangle with vertices at (−3, −1) , (1, 3) , (3, 1) , and (−1, −3) ?
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Add all the sides up to equal 30 in an equation because you are given the perimeter. The perimeter is the length around a two dimensional shape. This means the perimeter is the length of all the side lengths added together.
(x) + (2x + 2) + (13) = 30
Combine like terms.
3x + 15 = 30
Subtract 15 from both sides.
3x = 15
Divide both sides by 3.
Lets just use 
for an example. If the number is increased by 60% and the denominator is decreased by 20% we get the new fraction being: 
. Since then new one is equal to 1, and the original is equal to 
, we see that this manipulation of the fraction causes an increase of 100%.