And the last question

x must be greater then -3

Step-by-step explanation:

2(-3)-9 >-15= -6-9>-15

Thus, x must be greater then -3

table a is wierd

step-by-step explanation:

6*f

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: