A 20-1b bag of mulch costs $3.80, and a 30-1b bag of the same type of mulch costs $4.80. Greg found the unit price, which is the constant of proportionality between cost and weight, for each bag of mulch. What is the difference in the unit prices?
O A. $0.20 per pound
O B. $0.30 per pound
O c. $0.02 per pound
O D. $0.03 per pound
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The graph shown is the graph of which function?

Find the coordinates of point x that lies along the directed line segment from y(-8, 8) to t(-15, -13) and partitions the segment in the ratio of 5: 2.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.