Solve for b.
b + 0.9 = 5.1
Enter your answer, as a decimal, in the box.

4.2

Step-by-step explanation:

This one is pretty easy cause all you need to do is subtract 0.9 from 5.1

5.1 - 0.9 = 4.2

And to check it plug and play

4.2 + 0.9 = 5.1

Therefore, your answer is 4.2

Hope this helps <3