Solve the Rational Inequality $\mathrm { P } = \mathrm { t } ^ { 2 } - 30 \mathrm { t } + 216$

Solve the rational inequality. Write the solution set in interval notation.
-The profit made when t units are sold, t > 0, is given by $\mathrm { P } = \mathrm { t } ^ { 2 } - 30 \mathrm { t } + 216$ Determine the number of units to be sold in order for P > 0 (a profit is made) .

A) t > 18 or t < 12
B) 18 < t < 12
C) t = 30
D) t = 18 or t = 12

Correct Answer:

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