If F(x) = x - 7 and G(x) = x^3, what is G(F(x))?

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

What is the frequency of the sinusoidal graph?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?