Mr. Rios took his family to dinner the food amounted to $75.00 the restaurant also charges a %4 tax because the service was great he decided to leave the server an 18% tip

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

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?

What is the perimeter of a rectangle if the length is 5 and the width is x?