Solve using the substitution method. Use a graphing calculator to check your answer. x + 5y = 0x - 5y = 40
A. (20, 4)
B. (5, -1)
C. (-4, 20)
D. (20, -4)
Answer: D
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The function f(x) changes value when x changes from x0 to x0 + dx. Find the approximation error 
. Round your answer, if appropriate.f(x) = x2, x0 = 9, dx = 0.06
A. 1.0236 B. 0.0036 C. 0.0072 D. 0.0018
Write as a number.Three hundred twelve thousand, 
ninety-seven.
A. 3,206,970 B. 312,697 C. 312,697,000 D. 31,267
Solve.A group of 5 people wants to buy a boat. The boat costs $695. If they all pay the same amount, how much is each person's share?
A. $139 B. $149 C. $129 D. $115
Solve the problem.The height H (in feet) of a ball thrown into the air from the top of a building after t seconds is given by 
Find the height of the ball after 4.5 seconds by finding H(4.5). Round to the nearest tenth of a foot.
A. 195 feet B. 235 feet C. 335 feet D. 275 feet