Acar repair shop charges $89.79 per hour. if your car is worked on for .75 hours. how much should your car cost to be repaired?

Can you me find the missing length. i attached an image.

Plz hurry evaluate the expression a+b where a=8 and b=19

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.