When you divide a number by 1/2, the result is a) half the original number. b) twice the original number. c) 50% of the original number. d) 100% of the original number.

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?

12 point are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7