Calvin buys a $979.99 honda girl power generator at a discount 25% what is the price melvin pays for the generator

Can you answer my question? will mark brainiest!

Which logarithmic equation is equivalent to the exponential equation below? e^a=55(you will receive 34 points)

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?