Given: △abc, d∈
ac
m∠bdc=m∠abc
ad=7, dc=9
find: bc, bd ba

Step-by-step explanation:

Look at the picture.

ΔABC and ΔBDC are similar (AA - If two triangles have two of their angles equal, the triangles are similar).

Therefore the sides are in proportion:

We have:

AC = 16

BC = x

DC = 9

Substitute:

            cross multiply

Therefore BC = 12.

Calculate the similarity scale:

Therefore we have the poportion:

        cross multiply

         divide both sides by 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! )

need points to ask question

step-by-step explanation: