If the value of y varies directly with x, and x = 6 when y = 2, what is the value of x when y = 4?

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Acylinder has volume 45π and radius 3. what is it’s height?

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)