Question

A rectangle has a perimeter of 60 cm let X represent the length of one side of the rectangle which of the following functions models the area A(x) of the rectangle?

A. A(x) = x^2 + 30x
B. A(x) = 30x - x^2
C. A(x) = x^2 + 60x
D. A(x) = 60x - x^2

Answer 1

B. Is the answer I hope that helps

Answer 2

B.

Explanation:

P(x)= 2( x+y) //Rectangle perimeter => A(x)= xy //Rectangle area

60 = 2(x+y) =x(30-x) //Substituting y

60/2= [2(x+y)]/2 =30x - x²

30= x+y