For a school project, Tracy is investigating cell phone use in her hometown, Washington. So far, she has found that the residents of Washington used their cell phones for 179,580 minutes last year. This year, they used their cell phones for a total of 152,643 minutes. What is the percent of decrease in annual usage?

a

step-by-step explanation:

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:

$15.40 per mile

step-by-step explanation:

you have to round up to 4 because 6 is over 5 so you have to round the 3 up to 4