Which circle shows ab that measures 60

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2

Find the axis symmetry of x y=4x-6x+3