Mario buys 2 pounds of hamburger and 1 pound of sausage. sausage costs 10 cents more per pound than hamburger. if the total cost of the meat is $5.50, what is the cost of the hamburger per pound?

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.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?