Can someone help asap

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

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)

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.