If you know the diameter of a circle, how do you find its circumference? a) multiply the diameter by ? . b) multiply the diameter by 2? . c) square the diameter and multiply by ? . d) divide the diameter in half and multiply by ? .

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?

What is the missing constant term in the perfect square that starts with x^2 -20x

Angela is buying a dress that is on sale for 20% off. if the original price of the dress is $40.00, how much money is angela saving on the dress? a. $0.80 b. $3.20 c. $32.00 d. $8.00