who has answer key from "1.3" additional practice piecewise-defined functions? I really need the answers, it's worth 10% of my math grade. I really need those answers before Monday​

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

the equation of the line that passes through the points and has o form

if line passes through the points (-1, -3) and (2, 1), then

the equation in the standard form is