John and Dave sold hot chocolate for $3 a cup and cookies for $1.50 each at a fundraiser. They sold 30 items in total and made $63. How many cookies did they sell?

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.