2) C ( t ) = 4t =15

A) find C ( 4 ).

B) Find C ( t ) = 23.

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  a) 31

  b) t = 2

Step-by-step explanation:

Put the given value into the equation and solve for the unknown.

a) C(4) = 4·4 +15

  C(4) = 31

__

b) 23 = 4t +15

  8 = 4t

  2 = t

c

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