A.
1. Find the constant of variation of y varies jointly as x and z, and y=105 when x=7 and z=3.

3. If y varies jointly as x and z, given y=12 when x=5 and z=15, find y if z=8 and z=2.

B.
1. The price of a skirt varies jointly as it's length and waist size. If the length is 24 inches and the waist size is 32 inches, the skirt is priced at 280 P. How much will a skirt cost If the length Is 26 inches and the waist size is 36 inches?​