Answer:
Step-by-step explanation:
[tex]S=4LW+2WH\\\\\text{We have}\ S=136,\ L=7,\ W=4.\ \text{Substitute:}\\\\136=4(7)(4)+2(4)H\\\\136=112+8H\qquad\text{subtract 112 from both sides}\\\\24=8H\qquad\text{divide both sides by 8}\\\\3=H\to H=3[/tex]
h = 3
First, substitute for each known variable
136=4(7)(4)+2(4)H
136=8h+112
Then flip the equation
8h+112=136
Subtract 112 from both sides
8h = 24
Then divide 8 from both sides
h=3
