Help me out here please

12

Step-by-step explanation:

No. of planters = 4 ÷

To change the ÷ sign to a × sign, swap the denominators and numerators of the second fraction.

4 ÷  = 4 ×

Directly multiply.

4 × = 12

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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: