What is the percent of change if 18 is increased to 45?

What expression is equivalent to log3(x+4)

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

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).