Question

Shau-uen solve the equation 18.5w+6.5w-2.8w=149.1 Her work is shown below

Answer 1

The answer is 

C.- step 3

Answer 2

Answer:

Shaun make her first error in step 3. Answer C

Step-by-step explanation:

If have the same units you can simply add them, Like this:

Step (1)

18.5w+6.5w-2.8w= 149.10 (everything in the left side is in terms of w)

Step(2)  

25w-2.8w= 149.1 (add 18.5+6.5)

Step(3)

Here you have to add the terms of w

(25-2.8)w=149.1

22.2w=149.1

Step(4)

Here you  clear w

w=149.1/22.2

w=6.72