12 The function f(x) = 42+14(x - 1) can be used to determine the cost in dollars of a plumber's
labor for x hours. What is the rate of change of the cost in dollars with respect to the number
of hours?
F $14 per hour
G $28 per hour
H $42 per hour
$56 per hour

4. jake needs to score in the top 10% in order to earn a physical fitness certificate. the class mean is 78 and the standard deviation is 5.5. what raw score does he need? z value for top 10% =1.282 how do i get the z value? what is the equation for this? raw score =mean+z*sd = 78+1.282*5.5 = 85.051