You are the manager of a local charity. You expect 63 donors to begin donating electronically next year. This figure
represents 21% of the charity's donor list.
How many of the charity's donors will not donate electronically?
13
33
189
237
300

237

Step-by-step explanation:

63 / .21 = 300

300 total people on list

21 percent are electronic so 79 percent are not electronic

300 x .79 = 237

what is the original number? you forgot to add it.

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: