Consider a sample of rubber bands. Their weights are measured and found to have a variance of 2.57. Give a point estimate for the population variance in weights of rubber bands. Round your answer to two decimal places, if necessary.

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?

This question awards 100 ! i really don’t want to fail i will also mark you !

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)