Find the angle between the given vectors. Round to the nearest tenth of a degree, if necessary.a = 6i - 5j, b = 5i - 9j
A. 22.1°
B. 56.8°
C. 100.8°
D. 21.1°
Answer: D
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Find the difference.63 - (-23)
A. -86 B. 86 C. -40 D. 40
Solve the problem.The amount of time it takes a swimmer to swim a race is inversely proportional to the average speed of the swimmer. A swimmer finishes a race in 25 seconds with an average speed of 6 feet per second. Find the average speed of the swimmer if it takes 50 seconds to finish the race.
A. 3 feet per second B. 4 feet per second C. 2 feet per second D. 5 feet per second
Refer to the double-bar graph below which shows the number of male and female athletes at a university over a four-year period. Solve the problem.
Which year had the greatest number of female athletes? What was the total number of male athletes that year?
A. 2004; 375 athletes B. 2005; 475 athletes C. 2004; 350 athletes D. 2005; 325 athletes
Solve. If necessary, round percents to the nearest tenth, dollar amounts to the nearest cent, and all other numbers to the nearest whole.In the past ten years, the population of a city decreased from 140,000 to 
Find the percent decrease.
A. 7.7% B. 92.9% C. 1300% D. 7.1%