Can you solve this? Please ( 15+ points)

Step-by-step explanation:

First of all we will start with the brackets inside the equation,

1.

Now we can multiply 2 by all the values inside the parentheses

2.

I just wanted to confirm that the big X is a variable?

Fact: Did you know that there are about 4 types of parenthese: ( ) - round brackets, [ ] - square brackets, { } - curly brackets, and < > - angle bracket.

the answer is d

step-by-step explanation:

1. d.90

2. e. none of these (80)

3. a. 0

4. b. 6

5. e. none of these (10)

6. a. 5