an angle whose measure is 90° can be classified as which type of angle?

Combine like terms to make a simpler expression 3z+z

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Identify the number as a rational or irrational. explai. 291.87