Your answer should be an expanded polynomial in standard form.
(-t^4-5t^3-10t^2) +(9t^3+3t^2-1)=(−t
4
−5t
3
−10t
2
)+(9t
3
+3t
2
−1)

the answer is  

a.

4,624π mm2

step-by-step explanation:

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet