5(3x-4)+4=144is this answer -8 or -6?

First, let's distribute everything e.t.c, e.t.c.

-15x + 20 + 4 = 144

-15x +24 = 144

Isolate x:

-15x = 120

Divide:

x = -8

maximum area = xy = (16)(32) = 512 ft2

to maximize the area of the garden, the side of the fence parallel to the side of the house should be 32 ft long, and the other two sides should both have length 16 ft.'

source

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart