#1 The cost of butter is fixed. If 5lb. cost $4.00, how much will 7 1/2 lb cost?
#2 Y varies directly as X; That is Y/X = M. If Y = 6 when X = 3,
find Y when X = 11.
#3 In any triangle, A = 1/2 bh. When b is constant,
(a) Does A vary directly as h? Why?
(b) If h is halved, what happens to A?
(c) If A = 30 when h = 10, find A when h = 20.
d) If A = 40 when h = 6 2/3, find h when A = 50.
#5 If the lengths of the bases of a trapezoid are constant, does the area
vary directly as the length of the altitude? Why?