Me with this equation!

a+5= -7

possible answers:

a: -2
b: -12
c: 35
d: 7/5

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

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.

If jaime wants to find 60% of 320, which table should he use?