Find the unit rate with the second given unit in the denominator.

12 girls for every 5 boys

a. 2.4 boys/girls

b.2.4 girls/boy

c. 5 boys/girl

d.12 girls/boy

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.

Which equation represents a line that passes through the point (9, -4) and has a slope of 3/5?

Cate purchases $1600 worth of stock and her broker estimates it will increase in value by 4.2% each year. after about how many years will the value of cate's stock be about $2000