The table below shows the number of books on shelves at a library. Which of the following represents the number of books? Books: 21 42 105 147

Shelves: 1 2 5 7

A. Shelves x 3 C . Shelves + 15

B. Shelves x 21 D. shelves + 20

As shown in the figure, Isaiah's track forms a right triangle. Hence, we can apply the pythagorean theorem.

First, we find the hypotenuse or the longest side of the right triangle. The equation is: c^2 = a^2 + b^2, where c is hypotenuse, whereas a and b are the two shorter legs.

c = √(0.75^2 +1.2^2) = 1.415 miles

Therefore, the total distance is 1.415 + 0.75 + 1.2 = 3.37 miles