Use these functions to evaluate the following problems:
f(x) = x g(x) = x - 3 h(x) = x^2 - 9 k(x) = 2x

(f+g)(x)
(k+g)(x)
(f-k)(x)
(k-g)(x)

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?