Multiply and simplify.
? 
A. 
B. 
C. 
D. 120xy
Answer: A
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Use a proportion to solve the problem.The ratio of the distances a 7-iron and a 5-iron will drive a golf ball is 5 to 6. If a golfer averages 160 yards with a 7-iron, how far should he average with a 5-iron?
A. 192 yards B. 133 yards C. 149 yards D. 171 yards
Find projv u.v = k, u = 9i + 2j + 6k
A. 6k
B. 
k
C. 
i + 
j + 
k
D. 
i + 
j + 
k
Multiply.-7x6(-5x6 + 10x5)
A. -35x6 B. 35x12 + 10x5 C. -35x12 - 35x11 D. 35x12 - 70x11
Solve the problem.If x is the hydrogen ion concentration of a sample of water, then the pH of that water sample is 
If the pH of the water from one lake is 5.0 and the pH of the water from a second lake is 5.4, how many times greater is the hydrogen ion concentration of the second lake than the hydrogen ion concentration of the first lake? Round your answer to the nearest hundredth.
A. 8.43 B. 0.40 C. 2.51 D. 12.02