Substitute the Given Values into the Formula and Solve for the Unknown

Multiple Choice

Substitute the given values into the formula and solve for the unknown variable.
- $\mathrm { A } = \frac { 1 } { 2 } ( \mathrm {~B} + \mathrm { b } ) \mathrm { h } ; \mathrm { A } = 166.5 , \mathrm {~b} = 18 , \mathrm {~B} = 19$

A) 9
B) 342
C) 148
D) $18 \frac { 1 } { 2 }$