Please confirm if I did the follow problems correctly:

A) Find the sum or difference.
(5a – 3b) + (2a + 6b)= 7a + 9b
Answer: = 7a + 9b
B) Let’s work a few of these (FOIL)
1) (x+2) (x+8) = x 10
Answer: x10
2.) (x+5) (x-7) = x + 11
Answer: x + 11
3.) (2x+4) (2x-3) = 4x + 7
Answer: 4x + 7

A) 7a + 6b (3b is negative)

B) These are indicating that you need to multiply. (I don't know what "FOIL" means.)

1) (x+2) (x+8) = x^2 + 10x + 16

I'll let you use that same process to find the remaining answers.

A) Find the sum or difference.

(5a – 3b) + (2a + 6b) = 7a + 9b

To solve this problem, you need to add the like terms together. The like terms in this case are the terms that share the same variables.

So, adding the like terms:
(5a + 2a) - (3b + 6b) = 7a - 9b

Therefore, the correct answer is 7a - 9b.

B) Let’s work a few of these (FOIL)
1) (x+2) (x+8) = x10

To solve this problem, you need to apply the FOIL method, which stands for First, Outer, Inner, Last.

Using the FOIL method:
(x + 2)(x + 8) = x*x + x*8 + 2*x + 2*8
= x^2 + 8x + 2x + 16
= x^2 + 10x + 16

Therefore, the correct answer is x^2 + 10x + 16.

2.) (x+5) (x-7) = x + 11

Again, applying the FOIL method:
(x + 5)(x - 7) = x*x + x*(-7) + 5*x + 5*(-7)
= x^2 - 7x + 5x - 35
= x^2 - 2x - 35

Therefore, the correct answer is x^2 - 2x - 35.

3.) (2x+4) (2x-3) = 4x + 7

Using the FOIL method:
(2x + 4)(2x - 3) = 2x*2x + 2x*(-3) + 4*2x + 4*(-3)
= 4x^2 - 6x + 8x - 12
= 4x^2 + 2x - 12

Therefore, the correct answer is 4x^2 + 2x - 12.

Overall, you did not complete these problems correctly. The correct answers for each problem are:
A) (5a – 3b) + (2a + 6b) = 7a + 3b
B) 1) (x+2) (x+8) = x^2 + 16x + 16
2.) (x+5) (x-7) = x^2 - 2x - 35
3.) (2x+4) (2x-3) = 4x^2 - 2x - 12