How is dividing decimals different from dividing whole numbers? answer immediately.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

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?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12