Find all solutions of the equation in the interval [0, 2?).cos 2x = 
A. 
B. 
C. 
D. 
Answer: B
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Add. Do not use a number line except as a check.-76 + 49
A. 125 B. -27 C. -125 D. 27
Solve the problem.How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the function A(t) = 650e-0.189t, where t is the time in years? Round your answer to the nearest hundredth year.
A. 37.94 years B. 122.85 years C. 3.67 years D. 34.27 years
Use values from the compound interest table to find the compound interest. Round to the nearest cent.
$6000 at 10% compounded annually for 20 years
A. $34,365.00 B. $30,695.45 C. $12,000.00 D. $11,400.00
Solve the problem.If an object is thrown straight upward from the ground with an initial speed of 112 feet per second, then its height, h, in feet after t seconds is given by the equation h(t) = -16t2 + 112t. Find the instantaneous speed of the object at t = 6.
A. 112 ft/sec B. -80 ft/sec C. 16 ft/sec D. -464 ft/sec