How do I start with this? I have no clue how to do Z Scores

Z The average height of a male (in the United States) is 70 inches with a standard deviation of 3 inches. a. James is 81 inches tall. What is his Z Score and what percentage of males (in the United States) would he be taller than? i. Z Score: ii. Percent James is taller than: b. Terrell's height would give him a Z Score of 1.13. How tall is he (in inches) and what percentage of males (in the United States) would he be shorter than? i. Height (in inches): ii. Percent Terrell is shorter than: c. Xavier is taller than 30% of other males (in the United States). What is his Z Score and how tall is he, in inches? i. Z score: ii. Height (in inches)