the difference between high and low tides is 19 feet on monday and x feet on tuesday. write an expression to show the average rise and fall of the tide for monday and tuesday

No punctuation makes your question hard to read. If I interpret it correctly,

(19+x/20)

@DrBob222: I think you mean "(19 + x)/2"

To find the average rise and fall of the tide for Monday and Tuesday, we need to consider the difference between high and low tides for both days and calculate the average.

Let's assume the difference between high and low tides on Monday is 19 feet.
The difference between high and low tides on Tuesday is represented by the variable x.

To find the average rise and fall of the tide for Monday and Tuesday, we can use the formula:

Average = (Difference on Monday + Difference on Tuesday) / 2

Therefore, the expression to show the average rise and fall of the tide for Monday and Tuesday is:

(19 + x) / 2.