Test the solution x=3 for each equation

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Find the cosine function that is represented in the graph.

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