Solve using the substitution method.x + y = -5y = -5x + 3
A. (3, -15)
B. (2, -7)
C. (1, -5)
D. (-7, 2)
Answer: B
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Provide an appropriate response.Using a calculator, find the value of cos 195°. Round to four significant digits.
A. 0.9756 B. -0.9756 C. -0.9659 D. 0.9659
Solve the problem.The half-life of plutonium-234 is 9 hours. If 20 milligrams is present now, how much will be present in 4 days? Round your answer to three decimal places.
A. 0.918 mg B. 0.012 mg C. 9.548 mg D. 14.697 mg
Write the inequalities that describe the constraints on production.The Pen-Ink Company manufactures two ballpoint pens: silver and gold. The silver requires 7 minutes in a grinder and 12 minutes in a bonder. The gold requires 7 minutes in a grinder and 9 minutes in a bonder. The grinder can be run no more than 610 minutes per day and the bonder no more than 230 minutes per day. Let x represent the silver pens and let y represent the gold pens.
A. x + y ? 610, x + y ? 230, x + y ? 840, 
, 
B. 0 ? 19x + 16y ? 840, 
, 
C. 7x + 12y ? 610, 7x + 9y ? 230, 
, 
D. 7x + 7y ? 610, 12x + 9y ? 230, 
, 
Factor completely. If the polynomial is prime, say so.5x2 - 45x + 100
A. (5x - 20)(x - 5) B. 5(x - 4)(x - 5) C. 5(x - 20)(x + 1) D. Prime