Solve the problem.A local animal shelter accepts abandoned cats and dogs. They usually receive three times as many cats as dogs. They estimate that 80% of the cats and 50% of the dogs that come in need some kind of medical treatment. If they treated 261 animals last year, how many cats and dogs did they take in?
A. 270 dogs, 90 cats
B. 270 dogs, 810 cats
C. 90 dogs, 93 cats
D. 90 dogs, 270 cats
Answer: D
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Find the directrices of the ellipse.9x2 + 4y2 = 36
A. y = ± 
B. y = ± 
C. x = ± 
D. x = ± 
Solve the problem.A particular substance decays in such a way that it loses half its weight each day. How much of the substance is left after 10 days if it starts out at 128 grams?
A. 
g
B. 4 g
C. 
g
D. 8 g
Factor out the greatest common factor.x8y5 - x8y4 + x6y2 - x5y2
A. x5y2(x2y3 - x2y2 + xy - 1) B. x4y2(x3y3 + x3y2 + x + 1) C. x5y2(x3y3 - x2y2 + x - 1) D. x5y2(x3y3 - x3y2 + x - 1)
The figure shows the graphs of the cost and revenue functions for a company that manufactures and sells binoculars. Use the information in the figure to answer the question.
What is the profit when 964 binoculars are produced?
A. $3428 B. $428 C. $2356 D. $5356