Which ratio is equivalent to start fraction 3 over 7 end fraction? a. 6 to 10 b. 9: 21 c. start fraction 12 over 35 end fraction d. 7 to 3

B. 9 : 21

Step-by-step explanation:

Multiply numerator and denominator by 3:

... 3/7 × 3/3 = 9/21 ⇒ 9 : 21

Any denominator that is not a multiple of 7 will not work. 35 is a multiple of 7 (=5×7), but 12 (=4×3) is not the same multiple of 3.

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )

a

step-by-step explanation:

the answer is a