Can someone plz plz help me with the last 2 problems #5 and #6

i believe your answers would be

1/2c+7 and 2H-9

correct answer:

i^31 = -i

hello from mrbilldoesmath!

answer:   x^2 + y^2 = 1024

discussion:

the equation of a circle with center (h,k) and radius "r" is

(x-h)^2 + (y-k)^2 = r^2.

in our case

(x-0)^2 + (y-0) ^2 = 32^2 = 1024

you,

mrb