Can someone help me please

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

Find the area of an equilateral triangle with a side of 6 inches

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