In which of these situations do the quantities combine to make 0?

Read and think it

Step-by-step explanation:

Veronica receives $21 for babysitting. she then spends $21 on a new shirt.

step-by-step explanation:

try remembering the steps

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: