If a rectangle is 12 inches tall, 8 inches wide, and 2 inches in width (and or depth) what is the surface area? Oh and please help btw

Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?

If a line is defined by the equation y = 5x + 2, what is the slope?