Melody

There are 9C3 = 84 ways to choose 3 dots.

There are  8 ways that those 3 dots  can all be in a row.

So

I think that there are  84-8 = 76 different triangles that can be formed.

Where is the pic?

1 chain = 22*3 feet

so the area is  (22*3)*10  square feet

Good work !    

Who is Bro?

If you are going to comment on someone's input, you could at least make it clear, which input you are commenting on!

ok it is answered.

Let C be the number that Mrs Collins was supposed to bake and 

let F be the number that Mrs Franklin was supposed to bake.

F+C = 280   (1)

(1  +  1/5)C   +  (1 + 3/20)F = 328    (2)

now simplify and solve them simultaneously.

There is no question.

\(t_n=14+(n-1)*4 \)

you can simplify it

\(0.\overline{123}+\\ 0.\overline{345}\\~\\ 0.\overline{468} \)

4+6+8=?