Solve by the substitution method.-5x - 5y = -10-3x + 2y = -6
A. (2, 1)
B. No solution
C. (2, 0)
D. (1, 1)
Answer: C
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Solve the problem.A scientist performs an experiment to produce a compound by adding various amounts of a catalyst to a chemical reaction. Her data can be modeled by the formula A = 0.09c + 3.86, where A represents the amount of the compound, in grams, produced when c milligrams of the catalyst are added to the reaction. According to the formula, how much compound is produced when 
of catalyst are added?
A. 2703.86 g B. 1185.00 g C. 30.86 g D. 27.00 g
Find the stock turnover at cost and at retail. Round to the nearest hundredth.
A. Turnover at cost = 5.12 Turnover at retail = 5.17 B. Turnover at cost = 2.36 Turnover at retail = 2.34 C. Turnover at cost = 5.17 Turnover at retail = 5.12 D. Turnover at cost = 2.19 Turnover at retail = 12.09
Use multiplication to check the answer. If an answer is incorrect, find the correct answer.
A. Incorrect; should be 40,810 R5 B. Incorrect; should be 40,810 R6 C. Correct D. Incorrect; should be 40,811 R4
Solve the problem.How many different 10-letter words (real or imaginary) can be formed from the letters in the word PHILOSOPHY?
A. 45,360 B. 907,200 C. 453,600 D. 3,628,800