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 6.3 and the pH of the water from a second lake is 7.6, 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. 19.95
B. 6.74
C. 0.05
D. 16.08
Answer: C
Mathematics
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Solve the problem. Round your answer to 2 decimal places when necessary.The overall U.S. death rate for 60 year-olds is approximately 12 deaths per 1000 people. Suppose that a life insurance company insures 2000 60-year-old people. The cost of the premium is $760 per year, and the death benefit is $55,000. What is the expected profit or loss for the insurance company?
A. $200,000 profit B. $1,320,000 loss C. $310,000 profit D. $181,760 profit
Mathematics
Decide whether the expression is or is not an identity.tan A + tan B = 
A. Identity B. Not an identity
Mathematics
Multiply. Assume all variables represent nonnegative real numbers.
? 
A. 20
B. -12
C. -20
D. 12
Mathematics
Multiply.0.40 × 1000
A. 4000 B. 40 C. 400 D. 0.40
Mathematics