Perry observes the opposite, parralle walls of a room. in how many lines do the planes containing walls intersects

Asphere has a diameter of 10 in. what is the volume of the sphere?

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

What is the distance between a and b? round your answer to the nearest tenth. a coordinate plane is shown. point a is located at negative 1, 5, and point b is located at 4, 1. a line segment connects the two points.