The area of a square poster is 31 square inches. find the length of one side of the poster. Explain

5.57

Step-by-step explanation:

In order to find the are of a square you would use the equation a². However, since you are finding the length of one side and its a square, you use the equation . The area of this square is 31 sq in., so you would replace a with 31. The equation then becomes . When out into a calculator, the answer is 5.567764... which rounded up to the nearest hundreth is 5.57.

cheater

step-by-step explanation:

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240