F(x) = 3x+7

g(x) = 5x + 6

find f(x) and g(x)

I just want answer doesn't need to be specific.

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

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.

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.