Solve the system graphically.
?
?
A. (2, 0)
B. (2, -4)
C. (0, -2)
D. (2, -2)
E. (4, -2)
Answer: D
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Solve the problem.The Whitcher family learned that their investments decreased in value by 29% over the last year. If the investments were worth $84,000 at the beginning of the year, how much (in dollars) did they lose over the last year?
A. $2897 B. $2436 C. $244 D. $24,360
Provide an appropriate response.Using A = P(1 + rt), the future value formula for a simple interest investment, derive the formula for r, the rate of simple interest.
Fill in the blank(s) with the appropriate word(s).
Solve the system of equations by using substitution. 
A. x = 3, y = 9 B. x = 2, y = 8 C. x = 2, y = 9 D. x = 3, y = 8
Solve the problem.The energy cost of a speed burst as a function of the body weight of a dolphin is given by 
where w is the weight of the dolphin (in kg) and E is the energy expenditure (in kcal/kg/km). Suppose that the weight of a 
dolphin is increasing at a rate of 5 kg/day. Find the rate at which the energy expenditure is changing with respect to time.
A. -2.9951 kcal/kg/km/day B. -11.7541 kcal/kg/km/day C. -0.0012 kcal/kg/km/day D. -0.006 kcal/kg/km/day