Nine ice cream cones cost 11 dollars and x cents. Thirteen ice cream cones cost 15 dollars and y cents. What does x + y equal?

Round to the nearest ten thousandth. i dont get this

Calculate the mean value (expected value) of the following discrete variable x (10 points): x = 0, 1, 2, 3, 4, 5, 6 p(x) = 0.2, 0.2, 0.15, 0.15, 0.15, 0.1, 0.05

Plz , will award brainliest find an equation for the line that goes through the points (5,-8) and (13,4)