Perform the operation indicated.Add: 
A. -5x2 + 4
B. -5x2 + 10
C. 9x2 + 4
D. 9x4 + 4
Answer: C
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Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 776. Find a linear equation which fits this data, and use this equation to predict an average score for persons taking a 60-hour review course. Round your answer to the tenths place.
A. 741.2 B. 737.0 C. 751.0 D. 729.7
Write the number in expanded form.7,000
A. (7 ? 103) + (0 ? 102) + (0 ? 101) + (0 ? 100) B. (7 ? 100) + (0 ? 101) + (0 ? 102) + (0 ? 103) C. (7 ? 104) + (0 ? 103) + (0 ? 102) + (0 ? 101) D. (7 ? 101) + (0 ? 102) + (0 ? 103) + (0 ? 104)
Decide whether the graph opens up or opens down.f(x) = -x2 + 10x - 7
A. opens up B. opens down
Find the character of the roots.s2 + 3s + 2 = 0
A. Two different irrational solutions B. Two different imaginary solutions C. Two different rational solutions D. Exactly one rational solution