Annie enjoys going to the beach to look for shells. On Saturday, she found 4 times as many shells as she found on Sunday.
If Annie found 21 more shells on Saturday than on Sunday, how many shells did she find
altogether over the weekend?
shells

21.4 i did it already for s1

step-by-step explanation:

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!

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: