3 - (-6) = adding intergers

9

Step-by-step explanation:

To remove (-6) from the brackets, two minuses (negatives) cancel each other out becoming a plus (positive).

Example:

3 - (-6) = 3 + 6 = 9

*tip: if you see "- (-" imagine it automatically become a +*

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

hope this