Solve the problem.The length L (in in.) of a pendulum is slowly decreasing at the rate of 0.12 in./s. What is the time rate of change of the period T (in s) of the pendulum when L = 13.6 in., if the equation relating the period and length is 
A. -0.010 in./s
B. -0.0052 in./s
C. -0.043 in./s
D. -0.14 in./s
Answer: B
Mathematics
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Solve the problem.An airplane flying faster than the speed of sound creates sound waves that form a cone. If ? is the vertex angle of the cone and m is the Mach number for the speed of the plane, then 
Find ? to the nearest degree if 
A. 43° B. 45° C. 40° D. 38°
Mathematics
Solve the problem.During a drought, the water level in a river dropped 3 inches each day for 4 straight days. What was the change in the water level of the river during this period?
A. -12 in. B. 12 in. C. -7 in. D. 7 in.
Mathematics
Convert.9.5 centiliters to dekaliters
A. 95 dal B. 0.95 dal C. 0.0095 dal D. 0.095 dal
Mathematics
Complete.3 hr = ___ sec
A. 18,000 B. 10,800 C. 180 D. 1080
Mathematics