Substitute the given values into the formula, and solve for the unknown variable.
A = 1/2h(B+b); A = 110, B= 4, b=7
h=?
110 = 1/2h(4+7)
110 = 1/2h(11)
220 = 11h
h = 20
A = 1/2h(B+b); A = 110, B= 4, b=7
h=?
110 = 1/2h(11)
220 = 11h
h = 20