Help please I need to finish this rn

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?

A10 inch cookie cake is divided into 8 slices. what is the area of 3 slices

What is the value of the discrimination for the quadratic equation 0=×2+2+×2