F(x)=20x+13, find f(3)

f(3)=73

Step-by-step explanation:

So, when you see something like this, all you need to do is plug the number in for the variable.

In this case, plug 3 in for x.

f(3)=20(3)+13

20*3=60

60+13=73

f(3)=73

Part A

By the identity

(a2±2ab+b2)=(a±b)2

(16x2−8x+1)=(4x−1)2

so the side of the square is 4x-1

Part B

By the identity

(a2−b2)=(a−b)(a+b)

(81x2−4y2)=(9x−2y)(9x+2y)

then the sides of the rectangle are 9x-2y and 9x+2y

Step-by-step explanation: