algebra
posted by Teena .
I am having a hard time solving my problem
2ã20 + 5 ã 80  7 ã5
Can someone please help me

Is your ã symbol supposed to represent the square root of what follows?
If so, use the fact that
sqrt 20 = 2 sqrt 5, and
sqrt 80 = 4 sqrt 5.
Then collect terms. All will contain a sqrt 5 factor.