Helen had 46 books. Then she went to a book sale and bought b more books. Write an expression that shows how many books Helen has now. Type an asterisk ( * ) if you want to use a multiplication sign and a slash ( / ) if you want to use a division sign. I have an idea of my expression but maybe ya'll can give me another one #HELP ME HELP A FRIEND

46 + b = b or (what ever letter you want really)

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:

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