A group of friends go out for lunch. If five have hamburgers and four have hot dogs, the bill will be $19.50. If four have hamburgers and five have hot dogs, the bill will be $18.75. What is the price of a hamburger?

Which graph represents the equation y =4x

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.

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?