Decompose the terms in the sum as

so there are 20 terms in the sum. Then our sum simplifies to

Now, if

we can reverse the order of terms to get the same sum,

so that doubling up the sum gives

So, our sum evaluates to

Answer:
y = (2/3)x + 1.5
Step-by-step explanation:
To get our equation, we must first convert our values from inches to feet.
8/12 = 2/3 or 0.666667...
18/12 = 3/2 or 1.5
Now that we have our inches converted to feet, we can plug our values into the equation y = m(x) + b.
Answer:
22
Step-by-step explanation:
Working backwards
1+1 then x2 is 4
4+1 then x2 is 10
10+1 then x2 is 22