Given the following polynomial find the maximum possible number of turning points. f(x)=x^14 x^6 x^9 x^3

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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.