Which is a quadratic function having a leading coefficient of 3 and a constant term of -12?
f(x) = -12x2 + 3x + 1
f(x) = 3x2 + 11x - 12
f(x) = 12x2 + 3x + 3
f(x) = 3x - 12

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?

14. (05.02 lc) what is the value of y in the solution to the following system of equations? (5 points) 2x + y = −4 5x + 3y = −6

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.