Lauren and christie are practicing for a track meet. lauren runs four more than twice as many laps as kristy. kristy runs 12 laps how many laps does lauren run? how many laps do they run in all?

Shania's test scores in 8 subjects were 88, 91, 85, 74, 69, 72, 80, and 87. shania found the middle number of her scores. which type of measure did she find?

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?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36