Answer:
13
Step-by-step explanation:
(4,-5)(-1,7)
If you make a triangle and use the Pythagorean Theorem, the two legs have a distance of 5 and 12. 5^{2}+12{2}=25+144=169. The square root of 169 is 13.
Step-by-step explanation:
The total is 3.6 + 4.85 = 8.45.
I might be wrong but im sure it is equal
<u>Answer-</u>

<u>Solution-</u>
Here, n represents the number of months and f(n) represents the number of laptops in the store after n months.
As the store had 150 laptops in the month of January or at the beginning.
So 
Every month, 20% of the laptops were sold and 10 new laptops were stocked in the store.
As 20% of laptops were sold, so 80% were in the store.
So, after one month total number of laptops in the store,


Again after one month total number of laptops in the store,


Analyzing the pattern, the recursive function f(n) will be,

The commutative property of multiplication states that the order of multiplication of numbers does not matter.
Number Sentence:
2 * 3 = 3 * 2 = 6