Find the reciprocal of the number or algebraic fraction.
A. 
B. - 
C. 
D. 1 - 
Answer: C
Mathematics
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Solve for x. Check your answers.x - 18 = 15
A. x = -3 B. x = 33 C. x = -270 D. x = -33
Mathematics
What does the circuit symbol in the figure mean?
?
?
A. OR-gate B. Switch C. Battery D. AND-gate E. NOT-gate
Mathematics
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 5.2 and the pH of the water from a second lake is 6.6, 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. 18.59 B. 25.12 C. 6.14 D. 0.04
Mathematics
Find f'(x).f(x) = 
A. f'(x) = 8
B. f'(x) = 
C. f'(x) = - 8(x + 2)2
D. f'(x) = - 
Mathematics