Write an inequality for the range of the values of x

How many solutions does the nonlinear system of equations graphed bellow have?

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

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?