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I need help with all of the following !!

I need help with all of the following !!-example-1

1 Answer

7 votes
Here’s number 1:

1. 0r=5(r-4)
0r=5(r)+(5)(-4) (Distrubute)
0=5r-20
5r-20=0
5r-20+20=0+20 (add 20 to both sides)
5r=20
5r/5 = 20/5 (Divide both sides by 5)
r=4
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