Another tower is constructed by placing the
original tower on top of another cylinder with a
height of 18 inches and a radius of 54 inches.
What is the total surface area of the new tower?
Round your answer to the nearest hundredth.

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.

If the discriminant if a quadratic equation is 4 which statement describes the roots?

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?