Kamari is 17 years older than Darwin. In 4 years, the sum of their ages will be 49. Find Kamari's present age.

How many $20 bills do you need to have to make $280

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.

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy.how much will she pay after the discount