What is the inverse to f(x)=15x

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

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

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.