Solve the problem.If (4, -5) is the endpoint of a line segment, and (9, -8) is its midpoint, find the other endpoint.
A. (-6, 1)
B. (14, -2)
C. (-2, 5)
D. (14, -11)
Answer: D
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Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 93% of the isotope left?
A. 363 years B. 253 years C. 350 years D. 700 years
Solve the problem.The sum of three numbers is 3. The first, minus the second, plus 4 times the third, is 5. The third, plus 4 times the first, plus the second, is 0. What are the numbers?
A. -1, -1, 2 B. -1, 2, 2 C. 1, -2, -2 D. No solution
Find an equation of variation for the given situation. s varies directly as the square of t, and s = 147 when t = 7.
A. s = 21t2
B. s = 
t2
C. s = 3t2
D. s = 
t2
Solve the problem.In a survey about the number of siblings of college students, the following probability table was constructed: 
What is the probability that a student has 1, 2, or 3 siblings?
A. 0.51 B. 0.86 C. 0.6 D. 0.28