Final answer:
The given expression involves multiplication and subtraction. By setting up an equation and solving for x, we find that the input is 16.5.
Step-by-step explanation:
The given sequence of operations is not clear. However, based on the given information, we can deduce the following:
- The expression x 4 can represent the multiplication of x by 4.
- The expression - 9 can represent the subtraction of 9 from the previous result.
- Finally, the expression output = 57 represents the final result.
Using these deductions, we can set up the equations:
x * 4 - 9 = 57
Now, we can solve for x by performing the inverse operations in reverse order:
- Add 9 to both sides to isolate the multiplication:
- x * 4 = 66
- Divide both sides by 4 to solve for x:
- x = 16.5
- The input, therefore, is 16.5.