Find a Cartesian equation for the parametric equations.x = 4 cosh t , y = 5 sinh t
A. 
- 
= 1
B. 
- 
= 1
C. 
+ 
= 1
D. 
- 
= 1
Answer: D
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Solve the problem.The time it takes to complete a certain job varies inversely to the number of people working on that job. If it takes 28 hours for 11 carpenters to frame a house, then how long will it take 49 carpenters to do the same job?
A. 19.3 hr B. 40 hr C. 49 hr D. 6.3 hr
Identify the vertex of the parabola.y = x2 - 18x + 85
A. (4, 0) B. (4, 9) C. (0, 9) D. (9, 4)
Factor the polynomial completely. If the polynomial cannot be factored, say it is prime.x2 + 4xy - 21y2
A. (x - 3y)(x + 7y) B. (x + 3y)(x + y) C. (x + 3y)(x + 7y) D. Prime
The growth rate of the bacterium, a common bacterium found in the human intestine, is proportional to its size. Under ideal laboratory conditions, when this bacterium is grown in a nutrient broth medium, the number of cells in a culture doubles approximately every 20 min. If the initial cell population is 10, determine the function Q(t) that expresses the exponential growth of the number of cells of this bacterium as a function of time t (in minutes). How long will it take for a colony of 10 cells to increase to a population of 1 million? If the initial cell population were 100, how would this alter the model? ?
A. 
B. 
C. ?
D. ?