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For each problem below, solve algebraically. Then, use a table or graph to check your answer.

 Apr 8, 2019
 #1
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10 (million) = ,5 * 1.21^(x/2)        divide both sides by .5

20 = 1.21^(x/2)       Take LOG of both sides

log 20 = x/2  Log 1.21    divide by log 1.21

15.716 = x/2      mult both sides by 2

x =31.43 years

 

1988 + 31.43 years = 2019

 Apr 8, 2019

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