To represent the number of hours Tyrell still needs to volunteer to reach his goal of 26 hours, we can set up the equation:
\[ h + 17 = 26 \]
Where:
- \( h \) is the number of hours Tyrell still needs to volunteer.
- 17 is the number of hours he has already volunteered.
- 26 is his goal for the month.
Now, we can solve for \( h \):
- Subtract 17 from both sides of the equation:
\[ h = 26 - 17 \]
- Calculate the right side:
\[ h = 9 \]
So Tyrell still needs to volunteer:
\[ h = 9 \]
In conclusion, the working equation is:
\[ h + 17 = 26 \]
And the solution is:
\[ h = 9 \]