$$ −\frac{7}{10} \div\frac{2}{5}= \frac{-7}{4} $$ . totally answer. I hope helping with this answer
All you need to do is multiply 10 ft times 11, 12 ft times 8, and 6 ft times ten and then when you get all of the answers add them up and you have your answer
The square root is

Just square the top and bottom of the fraction.

and

so we have 12/16 and then we reduce to 3/4
2.18 that will be ur answer