The balance, B, in dollars, in a bank account depends on the amount deposited, A dollars, the annual interest rate, r %, and the time, t, in months since the deposit, so B=f(A,r,t).

(a) Is f an increasing or decreasing function of: The answers to chose from are after the ? mark.

A? ? increasing decreasing neither increasing nor decreasing somtimes increasing and sometimes decreasing r? ? increasing decreasing neither increasing nor decreasing somtimes increasing and sometimes decreasing t? ? increasing decreasing neither increasing nor decreasing somtimes increasing and sometimes decreasing

(b) Interpret the statement f(1000,4,18)?1822 by writing a sentence, including units. Then use your sentence to complete the following: The options to chose from are after the ? mark. The units of 1000 are: ? percent months dollars dollars/month percent/month The units of 4 are: ? percent months dollars dollars/month percent/month The units of 18 are: ? percent months dollars dollars/month percent/month The units of 1822 are ? percent months dollars dollars/month percent/month