Solve the problem.After being struck with a hammer, a gong vibrates 21 vibrations in the first second and in each second thereafter makes 
as many vibrations as in the previous second. Find how many vibrations the gong makes before it stops vibrating.
A. 28 vibrations
B. 23 vibrations
C. 94 vibrations
D. 84 vibrations
Answer: D
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Factor, if possible.9x2 - 39x - 30
A. 3(3x + 2)(x - 5) B. (3x + 2)(3x - 15) C. 3(3x - 2)(x + 5) D. (9x + 6)(x - 5)
Solve the problem.At a plant that packages bottled spring water, the water is passed through a sequence of ion-exchange filters to reduce the sodium content prior to bottling. Each filter removes 73% of the sodium present in the water passing through it. Determine the number of filters that must be used to reduce the sodium concentration from 21 parts-per-million to 1.69 parts-per-million.
A. 10 filters B. 11 filters C. 8 filters D. 9 filters
Multiply and simplify.(cos x - sin x)2
A. cos2x + 2 sin2x B. 1 C. 1 - 2 sin x cos x D. cos2x + 2 sin x - sin2x
A point on the terminal side of angle ? is given. Find the exact value of the indicated trigonometric function of ?.(- 
, 
) Find cos ?.
A. - 
B. - 
C. 
D. 