Solve the problem.Jane wants to buy a photocopier. The salesperson has the following information on 3 models. If all 3 are used, a specific job can be done in 50 minutes. If copier A operates for 20 minutes and copier B for 50 minutes, one-half the job is finished. If copier B operates for 30 minutes and copier C for 80 minutes, three-fifths of the job is done. Which is the fastest copier, and how long does it take for this copier to finish the whole job?
A. A is fastest; 120 minutes
B. C is fastest; 100 minutes
C. B is fastest; 100 minutes
D. C is fastest; 120 minutes
Answer: A
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Solve the problem.A person makes an initial deposit into a savings account paying 5% interest compounded annually. He plans to withdraw $100 at the end of each year.(a) Find the difference equation yn, the amount in the account after n years.(b) How large must the initial deposit be so that the money will not run out?
What will be an ideal response?
Factor the four-term polynomial by grouping.xy - 9yz + 11x - 99z
A. (y - 11)(x + 9z) B. (y + 11)(x - 9z) C. (y - 9)(x + 11z) D. (y + 9)(x - 11z)
Solve the problem. Express the answer in scientific notation to two decimals unless requested otherwise.The earth is approximately 92,900,000 miles from the sun. If 
what is the distance to the sun in meters?
A. 1.50 × 1010 m B. 5.7 × 10-10 m C. 5.7 × 1010 m D. 1.50 × 1011 m
Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for an to find a20, the 20th term of the sequence.1, 5, 9, 13, 17, . . .
A. an = 3n - 4; a20 = 56 B. an = n + 4; a20 = 24 C. an = 4n + 3; a20 = 83 D. an = 4n - 3; a20 = 77