Which of the following equations can be described as having an infinite number of solutions? (hint: use calculator)
a. 2x+4x-3=6x+4
b.5x+15=3x+20-5
c.8x-6=4(2x-1)
d.10x+3=2(5x+1)+1

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

What is the missing step in this proof ?

Which expression is equivalent to 3^3 + 2^2?