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Topic: ACT Math Question
Replies: 4   Last Post: Mar 31, 2013 4:15 PM

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Christopher Cargill

Posts: 1
From: Michigan
Registered: 3/11/13
ACT Math Question
Posted: Mar 11, 2013 4:39 PM
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I am having some difficulty with the following ACT practice problem:

For X, an angle whose measure is between 270° and 360°, cosX=5/13. Which of the following equals tanX?
A. -5/12
B. -5/13
C. 5/13
D. 5/12
E. 12/13

The book I am using provides the answer and an explanation, but the explanation uses process of elimination to find the answer without actually describing a method of solving the problem. I would like to understand how to actually find the answer. Can someone lend a helping hand?

Thanks!



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