What value in place of the question mark makes the polynomial below a perfect square trinomial?
9x2 + ? x + 49
A. 126
B. 42
C 63
D. 21

i dont know sorry

step-by-step explanation:

0lz try yourself sorry for not answering

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