Answer:
3x^2 + xy - 10y^2
Step-by-step explanation:
1. Use the FOIL method
3x
^2 − 5xy + 6yx − 10y
^2
2. Collect like terms
3x
^2
+ (−5xy + 6xy) − 10y^2
3. Simplify
3x
^2
+ xy − 10y^2
10 + -70
Step-by-step explanation:
Don't let the parenthesis fool you. Since there is a plus in the middle, you can just combine like terms. Let's do number 1:

Combine like terms.

This is as simple as you can get it. Now, let's do number 2:

Combine like terms.

This is as simple as you can get it.
Final Answers:
1.) 
2.) 
Least to greatest means left to right on a number line, so it is -6, 2.62, 7, 5420. Hope this helped!