Graph the parabola.y = -4x2 + 2x - 7
A. 
B. 
C. 
D. 
Answer: C
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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 will take longer than 355 seconds to run the mile.
A. 0.4893 B. 0.5107 C. 0.9893 D. 0.0107
Solve the problem. Round your answer to two decimal places.Hooke's Law for an elastic spring states that the distance a spring stretches variesdirectly as the force applied. If a force of 15 pounds stretches a certain spring 
then how much will a force of 
stretch the spring?
A. 3 in. B. 18 in. C. 5 in. D. 135 in.
Determine whether matrix B is the inverse of matrix A by finding the product AB.A = 
, B = 
A. B ? A-1 B. B = A-1
An experiment is conducted for which the sample space is 
Decide if the given probability function is valid.
A. No B. Yes