Gerard has 30$ to spend on lunch's this month lunch costs him 1.50 each day after gerard buys lunch for 8 days

Evaluate cos2θ for cosθ = square root of 3/2

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

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16