Find the domain of the rational expression. 
A. {x|x is a real number and x ? -2 and x ? 7}
B. {x|x is a real number and x ? 2 and x ? 7}
C. {x|x is a real number}
D. {x|x is a real number and x ? -2 and x ? -7}
Answer: B
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Solve the problem.The population of a small country increases according to the function B = 1,400,000e0.05t, where t is measured in years. How many people will the country have after 9 years?
A. 3,945,736 people B. 2,195,637 people C. 485,502 people D. 1,117,911 people
Solve the problem.The function A(x) = 1.06x -.02x3 gives the approximate alcohol level (in tenths of a percent) in a person's blood x hours after drinking about 8 ounces of 100-proof whiskey. What would the person's alcohol level be 2 hours after drinking? Give answer as a percent.
A. 0.196% B. 0.208% C. 1.96% D. 2.08%
Express the set using the set builder notation.A is the set of odd natural numbers less than 53.
A. {x?x ? N and x ? 53 and an odd number} B. {x?x ? N and x ? 51 and an odd number} C. {x?x ? N and x < 53} D. {x?x ? N and x < 52}
Factor when possible.3y3 - 6y2 - 45y
A. (y - 3)(3y2 + 15) B. (3y2 + 9y)(y - 5) C. 3y(y + 3)(y - 5) D. 3y(y - 3)(y + 5)