How many solutions exist for the system of equations below? none one two infinitely many

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Ineed someone to me answer my question i have to have this done and knocked out

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?