Simplify the expression.8 ? 7 - 7
A. 49
B. 0
C. 63
D. 392
Answer: A
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Solve the problem.A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 470 seconds and a standard deviation of 50 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 355 seconds.
A. 0.0107 B. 0.5107 C. 0.4893 D. 0.9893
Solve the linear inequality. Graph the solution set on a number line, and express the solution using interval notation.-4x - 5 > -5x - 11
A. [-6, ?)
B. (-?, -6]
C. (-16, ?)
D. (-6, ?)
Divide and simplify.
A. x2y2 - 3 - 9xy
B. xy - 3 - 
C. x2y2 - 3 - xy
D. x2y2 - 3 - 
Determine the degree of the polynomial.-x - 2x2 - 3x3 - 4x5
A. 5 B. 10 C. 4 D. 11