The art club has 12 members who are sixth graders 18 members who are seventh graders and 10 members who are eighth-graders. What percent of the art club members are seventh graders?

18%
25%
30%
45%

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

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.

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy