3. Your answer is A. 5x
To solve, you'd expand the brackets, so
3 × x = 3x
3 × 2 = 6
2 × x = 2x
2 × -3 = -6
And then combine the like terms to get 5x.
4. Your answer is F. 5x(3x + 7)
This is because if you multiply 5x by 3x you get 15x², and if you multiply 5x by 7 you get 35x, and those are the two terms.
I hope this helps!