Asine curve is periodic. what does this mean?

a. the curve goes through one cycle and starts over

b. there is no pattern

c. the amplitude stays the same

d. one period equals 180 degrees

What term best describes a line and a point that lie in the same plane? a. congruent b. coplanar c. collinear d. equal

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.

With both problems. a.s.a.p directions on photo ^