Help please!!! At a concession stand, seven hot dog(s) and two hamburger(s) cost $15.00; two hot dog(s) and seven hamburger(s) cost $18.75. Find the cost of one hot dog and the cost of one hamburger.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

Joanie watched 1 out of three of a movie in the morning