One number is 3 less than twice another. if their sum is 39, find the numbers. which of the following systems of equations represents the word problem? a) y=2x-3 and y=x+39 b) y=2x-3 and x+y=39 c) y=2(x-3) and x+y=39

What values of c and d make the equation true?

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?

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.