Three times the sum of a number and seven is 23 less than five times the number find the number wrong your answer to the nearest integer 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?

Which graph represents the equation y =4x

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16