The fourth-grade students at Tremont School receive a ribbon if they read 50 books during the school year. There are 69 ribbons given out at the end of the year. How many books did the students read in all? GIVING BRAINLIEST NVM I ALR ANSWERED THE QUESTION LOL (FRE E POINTS) BECAUSE NOBODY WILL ANSWERR

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b

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: