The height of the tallest tower in a city is 800 feet. The height of the second tallest tower in the same city is 14% less than
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Let 
be the common difference between terms in the sequence 
. Then
The first term in the sequence,
, satisfies
...
So the explicit formula for the
-th term in the sequence is
The first term in the sequence,
...
So the explicit formula for the
We are given area of the ribbon = 144 square inches.
We know formula for side of a square = .
Plugging value of area in the formula, we get
Side of the square
= 12 inches.
Sonya wants to sew ribbon along each side of a square pillow.
So, we need to find the perimeter of the square pillow.
<h3>Perimeter = 4 × side = 4 × 12 = 48 inches.</h3><h3>Therefore, she buy 48 inches of ribbon to have the exact amount that she needs.</h3>