Math 021 Test 2 Review Sheet - 2012 Page 9
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12MATH 021
Test 2 Review Sheet
09/12
ANSWER KEY
1.
A proportion is an equation formed by two equal
ratios. To solve a proportion, find both cross-
8.
c.
products and set them equal. Then solve the
resulting equation.
2.
A proportion is a true statement if the result of
cross-multiplication is the same number.
d.
3.
a.
b.
c.
d.
9.
a.
e.
b.
f.
c.
g.
d.
or
h.
i.
j.
10. A function is a relationship where for each input
4.
there is exactly one output.
11. vertical, x, y
12. a.
Yes, this is a function. The graph passes the
5.
Vertical Line Test. For each input, there is
exactly one output.
x is greater than or equal to -2.
b. No, this is not a function. The graph does
not pass the Vertical Line Test. For some
6.
x is between -2 and 4, including -2.
input, there is more than one output.
c.
Yes, this is a function. For each input, there
is exactly one output.
d. No, this is not a function. The input 1 has
more than one output.
7.
Reverse the direction of the inequality when you
multiply or divide both sides of the inequality by
13. a.
For a 2000 square foot store, the monthly
a negative number.
rent is $1700.
b.
8.
a.
14. a.
the number of hours worked
b. the amount of money earned
c.
the amount of money earned, the number of
hours worked
b.
d.
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