You have a bag of 20 marbles - small and big one. 12 are small (4 are blue, 3 are green, 2 are red, 1 is purple, and 2 are yellow). 8 are big (1 is orange, 2 are blue, 2 are green, 1 is red, 2 are yellow). P(Green Or Red)

i think it would be 42cm

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is:

is there more info provided? there is not enough information given in the problem