Adair needs $21,150 to purchase a boat. how much money will you need to invest today in a savings account earning 3.2% interest, compounded monthly, to have enough money to purchase the boat in seven years? a- $14,418.54 b- $1500.43 c- $20,681.57 d- $16,910.56

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

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.