(I'm going to show you the first problem)
25 - (3.1 x 6 +5.3)
Calculate everything in the parentheses first:
- 3.1 x 6 = 18.6
- 18.6 + 5.3 = 23.9
So now you only have two numbers
- 25 - 23.9 = 1.1
The answer is 1.1
Let me know if you need help with anything else!