Question

A person’s approximate brain weight is directly proportional to his or her body weight, and a person weighing 150 lb has an approximate brain weight of 4lb.

a. Find a mathematical model expressing the approximate brain weight of a person as a function of the person’s body weight.

b. Find the approximate brain weight of a person whose body weight is 176 lb.

Answer 1

(a)sorry...not good with functions

(b) 150/4 = 176/x (150 lbs to 4 lbs = 176 lbs to x lbs)
cross multiply
(150)(x) = (4)(176)
150x = 704
x = 704/150
x = 4.69 lbs.

Answer 2

its ok :)