What is the slope of the line through ( − 5 , − 10 )and ( − 1 , 5 )

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 is about circle theorems. someone asap : (

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.