11. Psychologists use the formula i = 100 m C to measure a person's intelligence. Called the intelligence quotient, or I.Q., i is expressed in terms of m, the person's mental age, and his or her chronological age, or number of years he or she has lived. C a) Find the I.Q. of someone whose mental age is 18 and whose chronological age is 15. b) Solve the formula for m in terms of i and c. c) Check your answer for part a of this exercise in your formula for part b, letting m = 18 and c = 15. d) Solve the formula that you wrote for part b of this exercise for c in terms of i and m.