Plz help I will mark you brainlist plz

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)

What is the solution of log2  (3x  -  7)  =  3? 4 5

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)