Differentiate the following by using the product rule:
(a) (9x^2-2)(3x-1) (c) x^2(4x+6) (e) (2-3x)(1+x)(x+2)
(b) (3x+10)(6x^2-7x) (d) (ax-b)(cx^2) (f) (x^2-3)x.1

Which statement justifies why angle ebc measures 90?

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.

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?