Use the Pythagorean Theorem to find the exact length of the missing side. Then approximate the length to the nearest thousandth.
A. 
? 18.358
B. 
? 2.646
C. 
? 13.229
D. 
= 87.501
Answer: C
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Multiply by moving the decimal point the appropriate number of places to the right.9.1 × 1000
A. 91 B. 9100 C. 91,000 D. 910
Give the exact value of the expression.cos 
A. 
B. 
C. 
D. 
Solve the problem.A force of 38 lb is required to hold a 66 lb toolbox on an incline. What angle does the incline make with the horizontal?
A. 54.8° B. 35.2° C. 73.3° D. 16.7°
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