Answer:
seven thousand
Step-by-step explanation:
Step-by-step explanation:
You must first know the formular for gradient then use the applied formular for slope
You've got 19 numbers. Their sum is 10(1+2+3+...+19) or

. Divide that by 19, to get
Given expression is
.
where 
Now we have to simplify this and find the next step so that negative exponent gets eliminated.
We know that when negative exponent changes sign, then it moves from numerator to denominator or from denominator to numerator as shown in the formula:

or
n has negative exponent in denominator so it will move to numerator and we get:

or 
Hence final answer is
.