Number of hot yoga practices per month define the variables and write a function that represent this situation

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.