Consider this quadratic equation. x2 + 2x + 7 = 21

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

step-by-step explanation:

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

d

step-by-step explanation:

i used the pitagoras theoreme