What are the slope and y-intercept for the line y = -1/2x + 3

a.) slope = 1/2 y-intercept = 3
b.) slope = -1/2 y-intercept = 3
c.) slope = 1/2 y-intercept = -3
d.) slope = -1/2 y-intercept = -3

(10 points)

Alake near the arctic circle is covered by a sheet of ice during the cold winter months. when spring arrives, the ice starts to melt. s(t) models the ice sheet's thickness (in meters) as a function of time tt (in weeks). s(t)=-0.25t+4

Can anyone me with 32,33,36,37,and 40.

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.