The value of a phone when it was purchased was $500. It loses 1/5 of its value a year. What is the value of the phone after 1 year?

step-by-step explanation:

the shape,the size and the distance

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:

step-by-step explanation:

(3rd option) - c