John has grades of 87 and 93 on his first two history tests. What must he score on his third test so that his average is at least 89.

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter3: Solving Equation And Problems
Section3.4: Using Equations To Solve Problems
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John has grades of 87 and 93 on his first two history tests. What must he score on his third test so that his average is at least 89.
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