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 4.9 and the pH of the water from a second lake is 6.8, 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. 5.26
B. 24.42
C. 0.01
D. 79.43
Answer: C
Mathematics
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Solve the inequality.x2 + 17x < 0
A. 0 < x < 17 B. x < 0 or x > 17 C. -17 < x < 0 D. x < -17 or x > 0
Mathematics
Solve the problem.The length a spring is stretched from its natural length with work, W
is given by L = 
where k is a constant for the given spring. If a certain spring has a constant of 76.6, and the spring is to be stretched 1.2 feet from its natural length, how much work will be necessary? Round your answer to the nearest tenth.
A. 46 ft-lb B. 110.3 ft-lb C. 42 ft-lb D. 55.2 ft-lb
Mathematics
Simplify.
7
A. 
B. 
C. x7y7
D. 
Mathematics
Find the exact value of the expression.sec
A. - 
B. 
C. - 
D. - 
Mathematics