Final answer:
The provided information contains mixed and fragmented mathematical content making it impossible to solve for f. Clarity on the complete equation or problem is required to assist further.
Step-by-step explanation:
The question seems to be about solving an equation with the variable f. However, the information given is fragmented and appears to be mixed with various unrelated mathematical expressions and statements. Some parts involve optics formulas with focal lengths and mirror equations, while other parts seem to list unrelated algebraic or numerical solutions. To properly assist with any equation, a clear and single mathematical expression or problem needs to be presented. Without this clarity, it is impossible to confidently provide a solution to the value of f in this context.
If the student can provide a clear and complete equation or question concerning the variable f, I would be more than willing to help solve for its value.