Can somebody help me , thank you ! need answer ASAP

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)

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

What is the average diastolic blood pressure for adults