1. what is the percent change from 1000 to 80?
2. what is the percent change from 45 to 63?
3. what is the percent change from 250 to 60?
4. what is the percent change from 60 to 99?

Step-by-step explanation:

1.-92%

2.40%

3.-76%

4.65%

2 apples

step-by-step explanation:

taking away equals subtraction. 6-4=2

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: