If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of y when xis 11
à - 18 (11)
y-1 (11)
y-(19)(5)
y-1315

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.

Simplify. 3(4+4x) (type your answer in with no spaces)