Mrs. barrett will be serving 40 people at lydee’s birthday party. she plans to make three meatballs for each person. mrs. barrett spent $39.00 at the store on the meat, which sells for $3.25 per pound. if mrs. barrett wants to make all the meatballs the same size, what will be the size, in pounds, of each meatball? be sure to show and explain all of your work to receive full credit.

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

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.