Solve. If needed, round money amounts to two decimal places and all other amounts to one decimal place.How much pure acid should be mixed with 9 gallons of a 50% acid solution in order to get an 80% acid solution?
A. 4.5 gal
B. 13.5 gal
C. 22.5 gal
D. 36 gal
Answer: B
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Factor, if possible.343c3 + 8
A. (343c + 2)(c2 - 14c + 4) B. (7c - 2)(49c2 + 14c + 4) C. (7c + 2)(49c2 - 14c + 4) D. (7c + 2)(49c2 + 4)
Perform the indicated operation without the use of a calculator and express each answer in decimal notation.
A. 60,000 B. 0.06 C. 0.00001667 D. 0.0006
Find the missing quantities. Round money to the nearest cent and rates to the nearest tenth of a percent.Cost price: $283.37Markup: $252.49Selling price:
% Markup on selling price: 
A. $535.86, 817.6% B. $535.86, 47.1% C. $30.88, 47.1% D. $30.88, 817.6%
Solve the problem.The logistic growth model 
represents the population of a species introduced into a new territory after t years. What will the population be in 30 years?
A. 1382 B. 143 C. 146 D. 160