Prove that any value of the expression 9^7+3^12 is divisible by 90

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

Let f(x) = x+3 and g(x) = 1/x the graph of (fog)(x) is shown below what is the range of (fog)(x)?

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?