John researches a baseball card and finds that it is currently worth $4.00. However, it is supposed to increase in value 10% per year. In how many years will the card be worth $31.15? If necessary, round the final answer to two decimal places. The card will be worth $31.15 in ___ years.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Find the multiplicative inverse of 8-12i