Which transformation gives the same result as a rotation 180 around the origin followed by a reflection over the y- axis

What is the volume of the sphere shown below with a radius of 3?

The ratio of wooden bats to metal bats in the baseball coach’s bag is 2 to 1. if there are 20 wooden bats, how many metal bats are in the bag?

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol