For the arithmetic sequence, find a 18 and a, when an = 10 and a 4 = 4.

what is the original number? you forgot to add it.

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

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.