Robert has 11 red folders, 6 blue folders, 15 green folders, and 7 black folders on his shelf.
If he randomly grabs a folder, what is the probability that it will be either blue or green?

A.6/13

B.7/13

C.23/38

D.3/5

Chose the graph below that represents the following system of inequality’s

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 equation can be solved to find x the measure of jk in the apex