Could you please check my answers.

1- -6.8² = 13.6
2- (- square root 196) -14
3- Simplify (square root) 100/49 = 10/7
4- Find the quotient of (-7 / 3) = 3/2

Thank you

1.

-6.8^2 , the way you typed it is -46.24
If you meant (-6.8)^2 , the you get 46.24

2. ok , if your answer is -14
3 ok

4. -7/3 is reduced to lowest terms
or as a mixed fraction = -2 1/3