Solve the problem.A chemist needs 12 liters of a 50% salt solution. All she has available is a 20% salt solution and a 70% salt solution. How much of each of the two solutions should she mix to obtain her desired solution?
A. 4.8 L of 20% ; 7.2 L of 70%
B. 6 L of 20%; 6 L of 70%
C. 3.6 L of 20%; 8.4 L of 70%
D. 2.4 L of 20%; 9.6 L of 70%
Answer: A
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Solve the problem.While traveling at a constant speed in a car, the centrifugal acceleration passengers feel while the car is turning is inversely proportional to the radius of the turn. If the passengers feel an acceleration of 20 feet per second per second when the radius of the turn is 40 feet, find the acceleration the passengers feel when the radius of the turn is 160 feet.
A. 8 feet per second per second B. 5 feet per second per second C. 6 feet per second per second D. 7 feet per second per second
Find the trigonometric function value of angle ?. Use a calculator if necessary.tan ? = 0.80978403, with ? in quadrant IFind sec ?.
A. 1.2867596 B. -1.3452821 C. -1.2867596 D. 1.3452821
Solve.
= 
A. 7.11 B. 5.9 C. 35.4 D. 0.35
Write the expression in exponential notation.5 ? 5 ? 7 ? 7
A. 2(5) ? 2(7) B. 5 ? 7 C. 52 ? 72 D. 54 ? 74