I just need to know what to do when I have this
-4ac
and I know what a and c are

What is the inverse of the function f(x)=4x+8

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8