Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
1. Solving Simple Equations
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Exercise 57 Page 10

Practice makes perfect
a The batting average is found by dividing the number of hits by the number of at-bats.
Batting average=hits/at-bats Since we know Player A's batting average, and the number of at-bats in 2011, substituting these values into the formula, we can calculate the number of hits.
Batting average=hits/at-bats
0.296=hits/446
132.016=hits
hits=132.016
hits=132
Player A had 132 hits in the 2011 regular season.
b We know that Player B had 33 fewer hits in 2011 than Player A. We can subtract 33 from 132, which we found in Part A, to find his number of hits.
132-33=99Since Player B had a greater batting average than Player A, we can write the following inequality using the formula for batting average. 0.296<99/at-bats Let's solve this inequality for the number of at-bats.
0.296<99/at-bats
0.296* at-bats < 99
at-bats < 334.459459...
at-bats<334
In order for Player B to have gotten 99 hits, and have a higher batting average than 0.296, the number of at-bats must be less than 344. Player A had 446 at-bats. Therefore, our friend was incorrect.