The altitude of the plane to the nearest tenth of a mile is

Tree diagram to find the prime factors of 18

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left