For a regular 15-gon:
a. what is the sum of the measures of its interior angles?
b. what is the measure of one interior angle?
c. what is the sum of the measures of its exterior angles?
d. what is the measure of one exterior angle?
e find the sum of your answers to parts b and d. explain why this sum makes sense.

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.

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project

Can someone me with my math problem pls my teacher is on my back about this