Log base 16 of 256 -log base 16 of 16

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

What expression is equivalent to (2x-1)(x-3)?

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.