Round the following decimal to the nearest tenth.
?
415.87
?
A. 415.8
B. 415.88
C. 415.9
D. 415.87
E. 416
Answer: C
Mathematics
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Solve.- 
k = - 6
A. -3 B. 18 C. 5 D. 6
Mathematics
Simplify using the order of operations.[(6.5 - 3) ÷ 4] - 2
A. 0.25 B. 0 C. -1.5 D. -0.125
Mathematics
Solve. Round results to the nearest thousandth.x2 + 8x - 32 = 0
A. 2.928, -10.928 B. 11.748, -19.748 C. 19.748, -11.748 D. 10.928, -2.928
Mathematics
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 
A. 3.19 B. 3.81 C. 2.81 D. 2.19
Mathematics