The mean age of R men in a club is 50 years, Two men aged 55 and 63, left the club and the mean age reduced by 1 year. Find the value of R

\(\begin{array}{c|c} x & 0 & 2 & 4 & 6\\ \hline y & 1 & 2 & 3 & 4\end{array}\).
The table is for the relation y = mx + c where m and c are constants. What is the equation of the line described in the tablet?

What is the value of x when y = 5?

y = \(\frac{1}{2}\)  x + 1

The subtraction below is in base seven. Find the missing number.
5 1 6 2_seven
-2 6 4 4_seven
--------
2 * 1 5
--------