A fast-food chain bought two pieces of land for new stores. the more expensive piece of land costs $20,756 more than the less expensive piece of land, and the two pieces together cost $168,072. how much did each piece cost?

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:

4+4+2x

or

2x+8

step-by-step explanation: