195 +15d=360
answer
subtract 195 from each side
15d=165
d=165/15=11
He would need to walk 11 dogs
Answer:
If Becca walks 2 dogs each month then in the 3rd month she walk 2 additional dogs.
Step-by-step explanation:
The answer i got is 2 because she walks 2 dogs each month so that means in month 3 she walked 2 dogs cause she walk 2 a month.
42/x = 30/100
Flip to get x on top and multiply 42 by 100. You get 4200 and then div that by 30 to get 140.
She had 140 before downloads
Answer:
Step-by-step explanation:
Let be a random variable that counts the number of failures preceding the first success and be a random variable that counts the number of failures between the first two successes. The probability of success in a independent trial is and both of them have Bernoulli distribution.
Assume that the number of unsuccessful trials before the first successful one is and that is a number of failures between two successes.
The joint mass function of two discrete random variables and is defined by
In this case, we have two discrete random variables and which are independent, so we have that their joint mass function is of the form
The probability that the number of failures before the first successful trial is equal to is
The probability that the number of failures between two successes is equal to is
Therefore,
Now, we obtain that that their joint mass function is
51 = 3k. We can switch this around to 3k = 51 (because it's easier for me)
3k = 51.
We divide by 3 on both sides to just get "k".
3k / 3 = 51 / 3
k = 17.