The sum of the first five terms is 11/2
<h3>How to determine the sum?</h3>
The series is given as:
1/2, -1,2,-4…
Calculate the common ratio of the series using
r = -4/2
Evaluate
r = -2
The sum is then calculated as:

This gives

Evaluate

Evaluate

Hence, the sum of the first five terms is 11/2
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Answer = 4 ft
Radius = Circumference / (pi x 2)
Radius = 8 / (4 x 2)
Radius = 4
X^2-8x-20 and if you rewrite that it’s (x-10) (x+2)
Answer:
Area = pi r²
area = 22/7 × 12 × 12 = 452.57 in²
37,
It is thirty seven, use a calculator