Need on this! asap! on letter c (all 3 questions)

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

For the inequality |c| < |d| to be true, which of the following must be true?

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?