You need to buy 5 notebooks for your classes at school. each notebook costs $2.79. what is the total costs of 5 notebooks before tax?

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

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?

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?