Rachel works at a bookstore. on tuesday, she sold twice as many books as she did on monday. on wednesday, she sold 6 fewer books than she did on tuesday. during the three days rachel sold 19 books. create an equation that can be used to find m, the number of books rachel sold on monday.

fill this in -- =

Answer with Step-by-step explanation:

Let m be the number of books Rachel sold on Monday.

On Tuesday, she sold twice as many books as she did on Monday.

i.e. On Tuesday she sold 2m books

On Wednesday, she sold 6 fewer books than she did on Tuesday.

i.e. On Wednesday she sold 2m-6 books

During the three days Rachel sold 19 books.

i.e. m+2m+2m-6=19

i.e.  5m-6=19

Adding both sides by 6, we get

5m=25

Dividing both sides by 5, we get

m=5

Hence, equation that can be used to find m is:

m+2m+2m-6=19

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! )