Can anybody tel me if I did it right or not plz don’t answer if you don’t know!!

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).

Apassenger train and a freight train leave san jose at 3pm, traveling in the same direction. the passenger train is going three times as fast as the freight train. at 6pm they are 240 miles apart. how fast is each travelling? explain your answer and show your