4. The amount of time, $m$ , it takes for an ice cube to melt varies inversely to the air temperature, a, in degrees. At $70^{\circ} F$ , the ice will melt in 20 minutes.
a. Find your "k. Show your work.

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Answer

3. Solve for k: $k = 20 \times 70 = 1400$

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Step 1 ：1. $m = \frac{k}{a}$

Step 2 ：2. $20 = \frac{k}{70}$

Step 3 ：3. Solve for k: $k = 20 \times 70 = 1400$