8th grade math in prealgebra
posted by Anonymous .
6(2x+3)=42

6(2x+3)=42
12x + 18 = 42
12x = 42  18
12x = 24
x = 24/12
x = 2 
a cabinet has shelves that are 12 1/2in.apart.on one shelf,katherine stacked a CD player that is 4 5/8 in. high on top of an amplifier that is 6 3/4 in.high. how much space was shace was left above the CD player?