The Answer is A
5x=85 (to find the x get the x alone so divide 5 from 5x and also do the same on the other side with 85)
112=4y+4 (minus 4 from 4y+4 and minus 4 on the other side as well with the 112, 112-4=108
108=4y (get the y by itself so divide 4 from 4y and divide 4 from 108 as well, 108/4= 27)
Having the angle in radians and the diameter of the circle we can easily calculate the length using the following expression
Length = angle(radians)*diameter/2
With this expression we can easily deduce the perimeter of a circle (length of the full arc)
Length = Perimeter = 2*pi*r
There is only one operation involved in this process
Surface area = 4 pi r^2
where
pi : 3.14 a constant
r : raduis
surface area is the change of volume with respect to raduis
volume = 4/3 pi r^3
dvolume/dr = 4 pi r^2
you can prove the identity with double integration in spherical coordinates or volumes of revolutions and polar coordinates
Answer:
Sorry i tryed my best and i'm pretty sure it's 263$.
sqrt(-49) / [ (7-2i) - (4+9i) ]
= 7i / (3 - 11i)
= 7i (3+11i) / [ (3 - 11i) (3 + 11i) ]
= (21 i - 77) / (9 + 121) = choice (d), (-77 + 21i) / 130
