Can some help me please!? I don't understand how to do it! (15PTS)

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

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 florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1