Algebra-2

If p varies directly as r and inversely as t, we can write the equation as:

p = k * (r / t)

where k is the constant of variation.

To find the value of k, we can substitute the given values of p, r, and t into the equation:

4 = k * (2 / 20)

Simplifying:

4 = k * (1 / 10)

Multiplying both sides by 10:

40 = k
...