Willie runs 3 miles in 36 min if willie runs at the same rate, how many miles can he run in 132 minutes

The system of equations graphed below has how many solutions?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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.