Solve the problem.The water acidity in a pool is considered normal when the average pH reading of three daily measurements is greater than 7.2 and less than 7.8. If the first two pH reading are 7.25 and 7.85, find the range of pH values for the third reading that will result in the acidity level being normal.
A. 6.5 < x < 8.3
B. 7.7 < x < 9.5
C. 7.1 < x < 8.9
D. 7.2 < x < 7.8
Answer: A
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Find the missing numbers. Round rates to the nearest tenth of a percent and dollar amounts to the nearest cent.
A. Markup: $35.07 Selling Price: $88.21 B. Markup: $80.52 Selling Price: $133.66 C. Markup: $119.14 Selling Price: $172.28 D. Markup: $66.00 Selling Price: $119.14
Find the exact value of the expression using a sum or difference identity.tan 
A. 2 + 
B. -2 - 
C. 
D. 
Solve the problem.If x represents the size of the order to replenish an inventory of computers, then the annual inventory cost is given by the function 
Simplify the expression for c(x) by performing the indicated addition.
A. c(x) = 
B. c(x) = 
C. c(x) = 
D. c(x) = 
Solve by completing the square.49x2 + 28x + 3 = 0
A. - 
, - 
B. 
, 
C. - 
, - 
D. - 
, 