Solve the mixture problem.A merchant has coffee worth $4 a pound that she wishes to mix with 60 pounds of coffee worth $7 a pound to get a mixture worth $5 a pound. How many pounds of the $4 coffee should be used?
A. 60 lb
B. 90 lb
C. 120 lb
D. 180 lb
Answer: C
Mathematics
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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
Mathematics
Find average for each set of numbers.19, 24, 23, 30
A. 23 B. 96 C. 24 D. 25
Mathematics
Determine the locus of points.
All points that are equidistant from two intersecting lines.
Mathematics
Find the exact value of y, or state that y is undefined.y = cos-1 (-4)
A. ? B. undefined C. -4 D. 0
Mathematics