Tyler plans to buy a laptop costing $800. He chooses to pay $250 up front and pay $55 each month for the remaining balance. Which equation can be used to find the number of months, x, Tyler needs to pay the installments? 250 + 55x = 800 250 + 55, x , = 800 250x + 55 = 800 250, x , + 55 = 800 800 + 55x = 250 800 + 55, x, = 250 800x + 55 = 250 800, x , + 55 = 250

F(x)= (x number of minutes talked)*0.35 + (monthly charge of 55)

so F(x) = 0.35x + 55

Step-by-step explanation:

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! )