Bob wants to find the best buy on laundry soap. Brand A costs $5.97 for 37 ounces. He has a coupon for $0.50 off the regular price of Brand B, which costs $7.13 for 50 ounces. Brand C costs $5.19 for 31 ounces. Which of these is the best buy?
a. Brand B
b. Brand C
c. Brand A
d. Brand B and Brand A cost the same per ounce
a. Brand B
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Solve the problem.In a computer simulation, growth in human populations threatens the population of a fictitious species, the striated perch, in North American waters. The bar graph shows the population of the striated perch for several years. The data can be modeled by 
where P is the population of that species, in millions, after t years. Use the formula to determine, to the nearest year, in what year there will be no more striated perch. 
A. year 33 B. year 35 C. year 43 D. year 45
Graph the line described.Undefined slope; through (2, 9)
A. 
B. 
C. 
D. 
Write the product in standard form.(
- 9i)(
+ 9i)
A. 22 B. 13 + 81i C. 94 D. 13 - 81i
Factor.x2 + 2x - 15
A. (x - 5)(x + 1) B. (x - 5)(x + 3) C. x2 + 2x - 15 D. (x + 5)(x - 3)