What the diffrence between 15 and -7

22

Step-by-step explanation:

15 - -7

Since there's a negative with a negative, it becomes positive

15 + 7 = 22

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:

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step-by-step explanation:

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