Answer:
boxes, 3,4,7,9,10,11 and 13 are the ones to be shaded.
hope this helps (:
This is the number of combinations of 2 from 23
23C2 = 23! / 2! 21!
A quick way to do this is 23*22 / 2 = 253
Answer: {-14,-26}
Step-by-step explanation:
Let x be the number.
Given statements: If 20 is added to the number, the absolute value of the result is 6.
i.e. |x+20| =6
Since 
So, 

hence, set of values of x = {-14,-26}
Answer:
165 meters is 5.5% of 3 kilometers.
Solution:
We need to calculate 165 meters is what percent of 3 kilometers.
When comparing or calculating percentage the two quantity should have same units.
So we need to convert 3 kilometers into meters
1 km = 1000 meters
So 
3 km = 3000 meters
Now, need to calculate 165 meters as how much percentage of 3000 meters
So we get
= 5.5%
Hence 165 meters is 5.5% of 3 kilometers.