How many cups of sorbet are used in a cups of punch

The parabola opens: y=√x-4 (principal square root) up down right left

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?