Which situation does not describe a negative integer?

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

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

12.0 million metric tons of beef produced annually in the u.s. out if 65.1 mikkion metric tons of produced annually worldwide