The sum of the measures of three angles of a quadrilateral is 290. The measure of the fourth angle is..?

Which statement justifies why angle ebc measures 90?

Which expression is not a polynomial?

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?