Add or subtract as indicated. Simplify, if necessary.
+ 
A. 
B. 
C. 
D. 
Answer: B
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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 65% 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 0.43 parts-per-million.
A. 11 filters B. 12 filters C. 9 filters D. 10 filters
Solve the problem.A local business deposited $400,000 in a 2-year time deposit earning 4% compounded daily. At maturity, what is the compound amount and interest earned?
A. $442,065.34; $42,065.34 B. $488,554.42; $88,554.42 C. $433,312.93; $33,312.93 D. $450,995.78; $50,995.78
Find the equation in standard form of the parabola described.Vertex at (0, 0); Focus at (25, 0)
A. y2 = -100x B. y2 = 100x C. y2 = 25x D. x2 = 100y
Perform the indicated operations.[(6x - 1) + 5y][(6x - 1) - 5y]
A. 36x2 - 12x + 1 + 60xy - 10y + 25y2 B. 36x2 - 12x + 1 + 25y2 C. 36x2 - 12x + 1 - 25y2 D. 36x2 + 12x + 1 - 25y2