Find the weighted mean. Round to the nearest tenth.
A. 25.3
B. 26.3
C. 2.7
D. 26.5
Answer: A
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Decide whether the proportion is true or false.
= 
A. True B. False
Without using a calculator, determine the value of the trigonometric function or state that the value is undefined.sin (18?)
A. 1 B. -1 C. 0 D. undefined
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 hydrogen ion concentration if the 
A. 1012 B. 10-12 C. 0.08 D. 2.48
Solve.A random check of air flights last month showed that 131 of the 170 flights checked arrived on time. If the inspectors check 230 flights next month, how many can be expected to arrive on time? (Round to the nearest whole number.)
A. 1 flights B. 97 flights C. 177 flights D. 298 flights