Find the derivative of f(x) = -2x2 + 11x at x = 9.
a) -25
b) -243
c) 63
d) 19

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?

Find the missing variable for a parallelogram: a = latex: 28in^2 28 i n 2 h = b = 6.3 in (1in=2.54cm)

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?