Solve the problem.A coin is tossed upward from a balcony 210 ft high with an initial velocity of 48 ft/sec. During what interval of time will the coin be at a height of at least 50 ft? 
A. 5 ? t ? 10
B. 0 ? t ? 5
C. 4 ? t ? 5
D. 0 ? t ? 1
Answer: B
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Find all solutions of the equation in the interval [0, 2?).2 cos2 x - 1 = 0
A. 
B. 
C. 
D. 
Determine whether the scatter diagram indicates that a linear relation may exist between the two variables. If a linear relation does exist, indicate whether the slope is positive or negative.
A. Linear with negative slope B. Nonlinear C. Linear with positive slope
Round to the nearest hundredth.1.721
A. 1.7 B. 1.73 C. 1.71 D. 1.72
Solve. Express the result in scientific notation. If necessary, round the decimal factor to two decimal places.If the mass of an object is 7.62816 × 10-6 tons and its volume is 8.22 × 10-3 cubic feet, find the density of this object. (Use the formula D = 
.)
A. 9.28 × 10-3 tons per cubic foot B. 9.28 × 10-5 tons per cubic foot C. 92.8 × 10-4 tons per cubic foot D. 9.28 × 10-4 tons per cubic foot