Solve the system of equations.
A. (5, 6)
B. (7, 4), (2, 9)
C. (7, 18), (2, 9)
D. (-7, 18), (-2, 13)
Answer: B
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A. 5x3 B. 5x11 C. -2x4 + 7x3 D. Can't be simplified
Provide an appropriate response.What is wrong with the following?
= 
= 12x2 - 18x + 1
What will be an ideal response?
Solve the problem.The temperature (in degrees Fahrenheit) of a dead body that has been cooling in a room set at 70° is measured as 88°. One hour later, the body temperature is 87.5°. How long (to the nearest hour) before the first measurement was the time of death, assuming that the body temperature of the deceased at the time of death was 98.6°. Assume the cooling follows Newton's Law of Cooling: U = T + (Uo - T)ekt.
What will be an ideal response?
Solve the problem.A teenager starts a company selling personalized mouse pads. The profit function, in dollars, for producing and selling x mouse pads is f(x) = -0.7x2 + 21x - 30, whose graph is shown. 
What are the start-up costs for the teenager's company?
A. $21 B. $127.50 C. $15 D. $30