Problem
4. The amount of time, \( m \), it takes for an ice cube to melt varies inversely to the air temperature, a, in degrees. At \( 70^{\circ} \mathrm{F} \), the ice will melt in 20 minutes. a. Find your "k. Show your work.
Solution
Step 1 ：1. \(m = \frac{k}{a}\)
Step 2 ：2. \(20 = \frac{k}{70}\)
Step 3 ：3. Solve for k: \(k = 20 \times 70 = 1400\)
