need to check answers please

Question

9/11-3/11+7/11=13/11=1 2/11 evaluate then to lowest form
One task took 7 minutes (min), a second task took 12 min, and
a third task took 21 min. How long did the three tasks take, as a fraction of an
hour?2/3
find perimeter of triangle 3/8 then other side 3/8 other side 3/8 = 1 1/8

Answer 1

correct; correct; correct. Go to the head of the class.

Answer 2

thanks!