Root 180 times a squared over root 80 times b squared

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

Find the maximum value of p= 4x + 5y subject to the following constraints :

What line represents the relationship between r and s