Answer:
e = 35
d = 124
f = 21
Step-by-step explanation:
Answer: x=21
Step-by-step explanation: 100+x-4+3x=180
4x=84
x=21
The length of the sides of the board are 12. (12 times 12 equals 144).
Answer:
0.9999985 = 99.99985% probability that in a day, there will be at least 1 birth.
Step-by-step explanation:
In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:
In which
x is the number of sucesses
e = 2.71828 is the Euler number
is the mean in the given interval.
Assume that the mean number of births per day at this hospital is 13.4224.
This means that 
Find the probability that in a day, there will be at least 1 birth.
This is:

In which
Then

0.9999985 = 99.99985% probability that in a day, there will be at least 1 birth.
If you would like to solve 8 * (x + 2), you can do this using the following steps:
8 * (x + 2) = 8 * x + 8 * 2 = 8 * x + 16
The correct result would be 8 * x + 16.