shirt is marked $38 but it is marked down 20% off. you have to pay 6.5% of sales tax. what is the final cost of the shirt?

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?

Somone me i want to know what 18 hours out of 24 hours in a fraction

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost