Final answer:
To find the total precipitation below average for both March and April, subtract the given differences for each month from the average precipitation. The answer is 2X - 19 inches.
Step-by-step explanation:
To calculate the total precipitation below average for both March and April, we need to find the sum of the differences between the average precipitation and the actual precipitation for each month. Let's assume the average precipitation is X inches.
In March, the precipitation was 4 inches less than average, so the actual precipitation was X - 4 inches.
In April, the precipitation was 15 inches less than average, so the actual precipitation was X - 15 inches.
The total precipitation below average for both March and April is (X - 4) + (X - 15). We can simplify this to 2X - 19 inches.
So, the answer is 2X - 19 inches.