How many
weeks are there in 81 days

At least 8

Reason: A week has 7 days in it, so when you divide 81 by 7, you get 7.5, so when you round it, you get the number 8

If you have any questions, corrections, or problems, let me know. I hope this helped

2

step-by-step explanation:

1+1=2

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.