When calculating the circumference of a circle with a diameter of 49 feet, why is using $\pi \approx \frac{22}{7}$ more convenient than using $\pi \approx 3.14$?

It results in a more precise answer.

The diameter is a multiple of 7, which simplifies the calculation.

The fraction is always easier to use than the decimal.

The decimal approximation is only used for radii.

A baker is making two round cakes. One has a 14-inch diameter and the other has a 20-inch diameter. Which approximations for $\pi$ are most efficient for calculating their circumferences?

Use $\pi \approx 3.14$ for both cakes.

Use $\pi \approx \frac{22}{7}$ for both cakes.

Use $\pi \approx 3.14$ for the 14-inch cake and $\pi \approx \frac{22}{7}$ for the 20-inch cake.

Use $\pi \approx \frac{22}{7}$ for the 14-inch cake and $\pi \approx 3.14$ for the 20-inch cake.