Can you help me answer the following C programming questions please

1. Given an integer variable b, write an expression that makes it positive if negative and negative if positive using a single operator. _____

2. In the following, you want to assign c the value of b + 1 and have b be incremented by 1 after the statement executes c = ___________;

3. What is the result of 7 - 2.5 + 10 % 6 of arithmetic expression? _____

4. What is the result of 4 + 2 * 3 / 2 of arithmetic expression ? ____