The answer is .107 by working left to right
Answer:
15 and 5 hours.
Step-by-step explanation:
Call x the time taken by the first chap, and y the second.

Let's divide by 5 and play with the LHS of the first equation a bit:
we know how much x+y is ( first equation!) let's solve.
At this point it's easy to check that 
Answer: 23F - (-8F)
Step-by-step explanation:
We have been given that at midnight, the temperature was . At noon, the temperature was .
Since our temperature has increased to 23 degree Fahrenheit from -8 degree Fahrenheit, we can represent this increase in temperature as:
Therefore, the expression represents the increase in temperature.
Answer:
options aren't given but the correct answer will be 
Step-by-step explanation:
There are 26 integers in the set

. If the wavelength of light is uniformly distributed, then the probability that it has a wavelength of any one of these integers is

, so the distribution of wavelengths has probability mass function

The mean (expected value) is given by

and the variance by

First, the mean:


(rounded up from an exact value of 642.5)
Now for the variance:


Meanwhile,

, which gives a total variance of

(rounded up from 56.5)