Given f(x) = -3x + 21, find x when f(x) = 6.
A)
-2.
B. 3
C. 5
D.7

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Step-by-step explanation:

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

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