Number of complete 90.9 MHz radio waves over a 1.50 km distance

You could answer this right away IF you knew the length of each wave, right?

Well, Wavelength = (speed) / (frequency).

Speed = 3 x 10⁸ m/s (the speed of light)

and

Frequency = 90.9 x 10⁶ Hertz.

So the length of each wave is 3 x 10⁸ / 90.9 x 10⁶ meters.

To answer the question, see how many pieces you have to cut

that 1.5 km into, in order for each piece to be 1 wavelength.

It'll be

(1,500 meters) divided by (3 x 10⁸ meters/sec) / (90.9 x 10⁶ Hz)

To divide by a fraction, flip the fraction and then multiply:

(1500 meters) times (90.9 x 10⁶ Hz) / (3 x 10⁸ meters/sec)

= 454.5