If f(x)=x^2+4 and g(x)=the square root of 1-x, what is the value of f(g(-3))?
a. 8
b. 13
c. 2i square root of 3
d. 2

4. find the geometric mean of 4 and 12. 24 8

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?

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?