1.   If y varies directly as the cube of x and y = 30 when x = 2, find x when
y = 468.75.
    A. 7 B. 5
    C. 3 D. 9
    Hint

  2.   If y varies inversely as x and y = 12 when x = 7, find x when y = 2.
    A. 7 B. 5
    C. 42 D. 10
    Hint

  3.   If y varies inversely as the cube of x and y = 8 when x = 2, find
x when y = 1.
    A. x = 8 B. x = 4
    C. x = 1 D. x = 2
    Hint

  4.   If y varies jointly as x and the cube root of z,
and y = 30 when x = -5
and z = 27, find y when z = -8 and x = 0.5.
    A. y = 2 B. y = 4
    C. y = -2 D. y = 20
    Hint

  5.   Which best describes this graph?
   
    A. none of these B. joint variation
    C. direct variation D. inverse variation
    Hint