If the federal reserve buys a treasury bond from a bank what will be the effect on the interest rate the bank charges its customers for a loan

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Can someone me and plz do the problem

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.