Write the equation of the parabola in vertex form:

1. 2x-y=11

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?

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

The area of a circle is equal to 1 dm². find the radius of the circle.