I need help please it due in 5 minutes

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

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