12.59
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The ratio given is 4:5 so you do 5divided by 20 which is 4 and multiply 4 and 4 and get 16 so your ratio is 16:20
This is a proportion problem. Eric earned 60 out of a possible 75 points, so the ratio is 60/75. You put that equal to x, so 60=x% and 75=100%. So it would look like
<u>60</u> = <u> x </u><u>
</u>75<u /> 100
then you cross multiply 60 and 100, and 75 and x, so you get
6000=75x
then divide by 75 and you have your percent :)
Of pie right <span>The square root of pi, like pi itself,
is an irrational number. It can be approximated to four decimal places
by 1.7725. The factorial of 1/2 is equal to half of the square root of pi.</span>
The answer is going to be B. Hope that helped