Consider the arithmetic series 
Let t=1 in the given series, we get
first term = 
= 3-4 = -1.
Let t=2 in the given series, we get
second term = 
= 
Let t=3 in the given series, we get
third term = 
Now, let t=18 in the given series, we get
last term = l = 
We get the series as
-1, 2, 5,..... 50
Sum = 
= 
= 
= 441
Therefore, the sum of the given arithmetic series is 441.
18/3(3)
18/9
2 would be your final answer
The answer is: 54 inches would be too long for a shoelace
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Eli lives closer to his friends house than his school
64+36+30+80= 210 yards sq, because you break up the playground into squares and rectangles then multiply the with times length. For the slanted part, you create it into a square and use the yd from the other sides of the playground.
