Final answer:
To find the value of r in the equation r/4 - 1 = 4, we add 1 to both sides and then multiply by 4, which gives us r = 20.
Step-by-step explanation:
Subtracting 1 from r/4 equals 4 can be represented as:
r/4 - 1 = 4
To solve this equation, we need to isolate r.
To do that, we need to get rid of the -1 on the left side of the equation.
To cancel out the -1, we can add 1 to both sides:
r/4 - 1 + 1 = 4 + 1
This simplifies to:
r/4 = 5
To solve for r, we can multiply both sides of the equation by 4:
4 * (r/4) = 4 * 5
This simplifies to:
r = 20