A department store sells the same socks in packages of 6 for $7.44 or packages of 9 for $11.43 Find the best price by solving the unit price of each package. (2 marks)

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: