HELP THIS IS A EMERGENCY please tell me all of it (it’s for my cousin in 5th grade)

3) Add 2.82, 3.44, and 4.15. Then round it so it looks like this : #.#
4) Add 0.55, 0.15, 0.40, and 0.05 all together
5) Subtract 0.39 from 0.72.
2.82 + 3.44 + 4.15 = _ . _
0.55 + 0.15 + 0.05 = _ . _ _
0.72 - 0.39 = _ . _ _