Solve the problem.Consider a project consisting of nine tasks (A through I) with the following processing times (in hours): 
D(3), E(6), F(4), G(8), H(7), and I(4). If a schedule with four processors has a finishing time of 15 hours, what is the total idle time in the schedule?
A. 6 hours.
B. 8 hours.
C. 2 hours.
D. 4 hours.
E. none of these
Answer: A
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Solve the problem. Use a calculator with an LN or a LOG key.The population growth of an animal species is described by 
where t is the number of months since the species was introduced. Find the population of this species in an area 6 months after the species is introduced.
A. 240 B. 74 C. 470 D. 704
Solve the problem.Find all values of y such that the distance between (2, y) and (-10, 3) is 13.
A. -2, 8 B. 2, 8 C. -8, 2 D. -8, -2
Solve the following system by any appropriate method. If there is no real number solution, so state.3x2 - y2 = 14x2 + 2y2 = 14
A. (
, 2), (
, -2), (-
, 2), (-
, -2)
B. (
, 4), (
, -4), (-
, 4), (-
, -4)
C. (
, 2), (
, -2), (-
, 2), (-
, -2)
D. no real solution
Solve the problem.The perimeter of a rectangle is 22 cm. One side is 5 cm longer than the other side. Find the lengths of the sides.
A. 3 cm, 8 cm B. 6 cm, 11 cm C. 3 cm, 5 cm D. 4 cm, 9 cm