Please help this is pre algebra :)

What is the difference between the points (4, 7) and (4, -5)? a. 0 units b. 2 units c. 4 units d. 12 units

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.