Plz now really important : ) 2. the following formula relates three quantities: force (f), mass (m), and acceleration (a). f = ma a. solve this equation for a. b. if the force is f = –25 units and the mass is m = 10 units, find the acceleration, a. c. if the force is f = 25 units and the acceleration is a = 5 units, find the mass, m.

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.