Solve. If needed, round money amounts to two decimal places and all other amounts to one decimal place.A chemist needs 60 milliliters of a 72% solution but has only 64% and 88% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 50 ml of 64%; 10 ml of 88%
B. 40 ml of 64%; 20 ml of 88%
C. 20 ml of 64%; 40 ml of 88%
D. 10 ml of 64%; 50 ml of 88%
Answer: B
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Find the exact value of the expression.cos 
cos 
- sin 
sin 
A. 0
B. 1
C. -1
D. 
Evaluate.-84
A. 4096 B. 32 C. -4096 D. -32
Solve the problem. Round rates to the nearest tenth of a percent and dollar amounts to the nearest cent.Bob's Tires manufactures steel-belted radials at a cost of $54.43 each. Bob then sells the tires at a 52.9% markup based on cost. Find (a) the markup, (b) the selling price, and (c) the markup as a percent of selling price.
A. (a) $28.79 (b) $83.22 (c) 34.6% B. (a) $102.89 (b) $157.32 (c) 189.0% C. (a) $102.89 (b) $157.32 (c) 65.4% D. (a) $28.79 (b) $83.22 (c) 52.9%
Solve.The outside of a water storage tank is in the shape of a sphere. If the radius is 19.4 feet, approximate the volume of the tank in cubic feet. Use ? = 3.14 and round to the nearest hundredth, if necessary.
A. 1181.77 ft3 B. 1575.69 ft3 C. 30,568.46 ft3 D. 22,926.35 ft3