Solve the problem.The Neighborhood Lemonade Stand, Inc. reported net incomes of -$175, -$284, and -$250 for the past three years. What was its total net income for these three years?
A. -$534
B. $709
C. -$459
D. -$709
Answer: D
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Solve the problem.A student is told to work any 8 out of 10 questions on an exam. In how many different ways can he complete the exam? (The correctness of his answers has no bearing.)
A. 45 B. 100,000,000 C. 16 D. 90
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 3 or more siblings?
A. 0.25 B. 0.13 C. 0.75 D. 0.12
Convert the angle in degrees to radians. Express the answer as multiple of ?.-54°
A. - 
B. - 
C. - 
D. - 
Which method should be used to solve the system? Explain your answer, including a description of the first step.7x2 - 8y2 =1002x + 2y =3
What will be an ideal response?