An artist wants to frame a square painting with an area of 400 square inches she wants to know the lenth of the wood trim that is needed to go around the painting if x is the length of one side of the painting what equation can you set up to find the length of a side

The formula for the area of a square with sides of length x is  A = x2  so  

x2 = 400  is the equation  

This equation has 2 solutions, namely x = ±√400 = +20 or -20  

The negative solution does not make sense because a length cannot be less than 0.  

The total length needed to go around the painting is the perimeter of the square, which is  

P = 4*x = 4*20 = 80 inches

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1