Answer:
-2.7
thats the answer but i cant submit without some words lol
To find the mean, add all of the values and then divide by how many numbers
to get the median, you have to write out every number, how many ever times it appears and cross them out from the side to get to the middle number. Essentially the median is the middle number. if there are 2 middle numbers, add together and divide by 2
Option A
The values of x are 3.58 or 0.42
<u>Solution:</u>
Given, equation is 
We have to solve for the x and choose from the options given,
Now, take the equation,

Negative sign cancels on both sides

Taking square root on both sides, we get


Hence, the values of x are 3.58 or 0.42, so option A is correct.
There are two parts in the given collection. One contains quarters and other contains dimes.
Let's compare the whole coin collection to the quarters.
One way to represent the ratio is 15 : 7.
The other way is 
84 kilometers ... 1 hour
7 kilometers ... x hours = ?
If you would like to know how long does the pigeon take to fly 7 kilometers, you can calculate this using the following steps:
84 * x = 1 * 7
84 * x = 7 /84
x = 7/84
x = 1/12 hour
Result: A pigeon can fly 7 kilometers in 1/12 hour.