Rewrite the word sentence, a number n is at least 4 as an inequality

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)

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?

Here is another math questions. i will keep asking different questions. 4^2x=6