How do i simplify this problem?

12r+5s-7T+9s-4r

8r + 14s - 7T

Step-by-step explanation:

Hello!

We have to make sure the terms are like terms before we add them.

Like terms are terms with the same variable so we can add r's with r's, t's with t's, etc.

There are two r's and two s's so we can simplify those

12r - 4r = 8r

5s + 9s = 14s

Now put these all together with the T in the original equation to get the answer

8r + 14s - 7T

Hope this helps!

3.9

Step by Step Explanation

2 and 3 over 5= 2.6

1 and 3 over 10=1.3

2.6+1.3= 3.9