Solve using matrices. x + 7y = -23x + y = 34
A. (3, 7)
B. (12, -2)
C. (7, 12)
D. (-2, 3)
Answer: B
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Solve the problem.A rectangular box with square base and no top is to have a volume of 32 ft3. What is the least amount of material required?
A. 36 ft2 B. 40 ft2 C. 48 ft2 D. 42 ft2
Solve the problem. Round your answer to 5 decimal places when necessary.The table shows the leading causes of death for one country in a single recent year. 
Assume a population of 88.5 million.What is the death rate due to heart disease in deaths per 100,000 of the population?
A. 2.124 deaths per 100,000 B. 24 deaths per 100,000 C. 21.24 deaths per 100,000 D. 240 deaths per 100,000
Solve the right triangle for all missing sides and angles to the nearest tenth.
c = 14B = 27.6°
A. A = 62.4°, a = 12.4, b = 7.3 B. A = 62.4°, a = 12.4, b = 6.5 C. A = 62.4°, a = 7.3, b = 6.5 D. A = 62.4°, a = 6.5, b = 12.4
Solve the problem.Marianne is planning a shopping trip to buy birthday gifts for her son. She estimates that the total price of the items she plans to purchase will be between $350 and $400 inclusive. If sales are taxed at a rate of 8.375% in her area, what is the range of the amount of sales tax she should expect to pay on her purchases? If Marianne's budget for the shopping trip is $425, will she necessarily be able to buy all the gifts that she has planned?
A. $29.31 ? x ? $33.50, where x represents the amount of sales tax; Yes. B. $29.31 < x < $33.50, where x represents the amount of sales tax; Yes. C. $29.31 ? x ? $33.50, where x represents the amount of sales tax; No. D. $29.31 < x < $33.50, where x represents the amount of sales tax; No.