Solve similar triangles advanced solve for x

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 of the following equations is equivalent to x/3-6/x=1

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?