Find all values of a for which f(a) is the indicated value.f(x) =
; f(a) = 
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 can run the mile in less than 355 seconds.
A. 0.0107 B. 0.5107 C. 0.4893 D. 0.9893
Solve the problem.From a thin piece of cardboard 20 in. by 20 in., square corners are cut out so that the sides can be folded up to make a box. What dimensions will yield a box of maximum volume? What is the maximum volume? Round to the nearest tenth, if necessary.
A. 6.7 in. × 6.7 in. × 6.7 in.; 296.3 in3 B. 13.3 in. × 13.3 in. × 6.7 in.; 1185.2 in3 C. 10 in. × 10 in. × 5 in.; 500 in3 D. 13.3 in. × 13.3 in. × 3.3 in.; 592.6 in3
Divide.
A. a84 B. 84 C. a12 D. a4
Determine whether the matrix is in row-echelon form. If it is, then determine also whether it is in reduced row-echelon form.
A. Yes; yes B. Yes; no C. No