Me i need to know the answer to this question in under an hour : -)

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?

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?