Solve for:
x^2+4=40
and
x^2+8x+16=20

If eh = hg and hg=16, find the diameter of k

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Nine more than four times a number is the same as one less than twice the number. find the number?