Evaluate the logarithm using the change-of-base formula. Round your result to three decimal
places.
?
log15 1,500
?
A. 5.701
B. 3.701
C. 2.701
D. 6.701
E. 4.701
Answer: C
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Provide an appropriate response.A gear with 80 teeth turns at 30 rpm on another gear with 100 teeth. What is the speed of the second gear?
A. 267 rpm B. 0.42 rpm C. 24 rpm D. 37.5 rpm
An object attached to a coiled spring is pulled down a distance a from its rest position and then released. Assuming that the motion is simple harmonic with period T, write an equation that relates the displacement d of the object from its rest position after t seconds. Also assume that the positive direction of the motion is up.a = 20;
T = 4? seconds
A. d = -20 cos 
B. d = -20 sin 
C. d = -4 cos 
D. d = -20 cos 
Solve the problem.A certain radioactive isotope has a half-life of approximately 1700 years. How many years would be required for a given amount of this isotope to decay to 75% of that amount?
A. 425 yr B. 631 yr C. 706 yr D. 3400 yr
Solve the problem.Suppose that y is inversely proportional to x and that y = 40 when x = 9. Find the constant of proportionality k. Then use y = 
to find y when x = 8.
A. k = 180; y = 22.5
B. k = 360; y = 45
C. k = 72; y = 9
D. k = 
; y = 