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Elementary and Intermediate Algebra
Mark Dugopolski, Southeastern Louisiana University

Functions
Variation

Warm-Ups



1

If a varies directly as b, then a = kb.
A)TRUE
B)FALSE
2

If a is inversely proportional to b, then a = bk.
A)TRUE
B)FALSE
3

If a is jointly proportional to b and c, then a = bc.
A)TRUE
B)FALSE
4

If a is directly proportional to the square root of c, then a = kc1/2.
A)TRUE
B)FALSE
5

If b is directly proportional to a, then b = ka2.
A)TRUE
B)FALSE
6

If a varies directly as b and inversely as c, then a = kb/c.
A)TRUE
B)FALSE
7

If a is jointly proportional to c and the square of b, then a = kc/b2.
A)TRUE
B)FALSE
8

If a varies directly as c and inversely as the square root of b, then a = kc/b.
A)TRUE
B)FALSE
9

If b varies directly as a and inversely as the square of c, then b = kac1/2.
A)TRUE
B)FALSE
10

If b varies inversely with the square of c, then b = k/c2.
A)TRUE
B)FALSE