Your answer is correct :)
Suppose you flip a coin and roll a die at the same time. These are compound events. These events are independent. Independent events occur when the outcome of one event does not affect the outcome of the second event. Rolling a four has no effect on tossing a head.
If the area of one is 20, that the area of 30 is 20*30=600 square inches.
91.40 - 50.00 = 41.40
41.40 ÷ .45 = 92
David sent 92 text messages.
(sorry if the format is wrong)