Which of the following binomials is a difference of squares? 5x^2-10. x^2-1. x^2-6 I REALLY NEED THIS ASAP SOMEONE PLEASE HELPP!!!

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

Yvaries inversely as x. y =12 when x=5. find y when x=4

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?