What is the y-intercept of the line shown?

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 value of x in the equation 2(x-4) = 4(2x + 1)?

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)