Question 394.
Given the formula:

Let's solve for the following:
(a). Solve for r, when:
d = 160 and t = 2.5
To solve for r, rewrite the formula for r.
Divide both sides of the equation by t:

Now, substitute 160 for d and 2.5 for t and solve for r.
We have:

Therefore, the value of r is 64