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1. c varies directly as a
2.x is jointly proportional to y and z
3.w varies inversely as x
4.r varies directly as the square of s
5.f varies jointly as x and y
6.j is inversely proportional to the cube of m
7.h is directly proportional to b
8.x is jointly proportional with the square of a and the square root b
9.a is inversely proportional to b​