HELP NOW Determine whether each pair of expressions is equivalent
Select Equivalent or Not Equivalent for each pair of expressions
4 (2n + 1) and 8n +1
9+9+9+9+g and 5g
169 + 20 and 4(49+20)
2? + 3y and I - I + y + y + y

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.

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Plz hurry finals a paper cup in the shape of an inverted cone is 8 inches tall and has a radius of 1.5 inches. how much water can the cup hold? use 3.14 for pi. round the answer to the nearest tenth. a) 12.6 cubic in. b) 18.8 cubic in. c) 37.7 cubic in. d) 56.5 cubic in.