5x + 8y = 4
2x+3y = 7​

(44, - 27 )

Step-by-step explanation:

Given the 2 equations

5x + 8y = 4 → (1)

2x + 3y = 7 → (2)

Multiplying (1) by 2 and (2) by - 5 , then adding the result will eliminate x

10x + 16y = 8 → (3)

- 10x - 15y = - 35 → (4)

Add (3) and (4) term by term to eliminate x

y = - 27

Substitute y = - 27 into either of the 2 equations and solve for x

Substituting into (2)

2x + 3(- 27) = 7

2x - 81 = 7 ( add 81 to both sides )

2x = 88 ( divide both sides by 2 )

x = 44

solution is (44, - 27 )

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! )