A classroom has 20 seats arranged in 5 rows of 4 seats each. Each student is randomly assigned a seat. What is the probability that the first student is placed in the first row?

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

List the sides of δrst in in ascending order (shortest to longest) if: m∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12°

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