It's just not realistic to present a list of 12 math questions and ask for the answers to all of them at once. Please post only one question at a time and please share your thoughts about how to solve that question.
I'll focus on one problem: <span>7 2/3 + 2 7/12
Here the LCD (lowest common denominator) is 12. 7 2/3 becomes 7 8/12.
Add 7 8/12 and 2 7/12:
7 8/12 +2 7/12 ----------- 9 15/12 15/12 is not a proper fraction. Write it as 1 3/12, or 1 1/4.
Then your 9 15/12 becomes (9+1) 1/4, or 10 1/4.</span>
Using this information we know we could divide 12/2=6. We also know that we could multiply 2×6=12. Therefore, we know that the model plane is 6ft tall.
