To solve this problem we have to use the Pythagorean theorem. The longest side of the triangle is called the "hypotenuse". C² is the longest side so it is the hypotenuse . To calculate c² we have to do α² + β² = c².
Given
⇒ a² = 16
⇒ b² = 28
⇒ c² = unknown
To solve the problem you have to add a² and b².
a² = 16 <span>b² = 28 </span> 16² + 28² = c²
16² = 16 x 16 28² = 28 x 28
16² = 256 28² = 784
258 + 784 = 1040
a² + b² = 1040
The next step is to find the square root of 1040
√1042 = 32.2490
= <span>32.2490 is rounded to 32.25 </span> Answer = (D)
So you start off with $21.50. Subtract $4 from 21.50 and you'll end up with $17.50. Now divide $17.50 with the price of each ride which is $2.50 and you end up with 7. You are able to go on 7 rides.