Jim eats 12 centiliters of ice cream with 60 milliliters of chocolate syrup. how much did jim eat in total?

The system of equations graphed below has how many solutions?

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.