When the factors of a trinomial are (x+p) and (x-q) then the coefficient of the x-term in the trinomial is:
A. The quotient of p and -q
B. The product of p and -q
C. The sum of p and -q
D. The difference of p and -q

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?