Daniel's mother has a 15% discount coupon she plans to use at the grocery store today. after the discount is applied, how much will she pay for an item that originally costs $7.80, before applying sales tax?

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?

Every time you drive you will experience a combination of driving conditions and environments.

Question: what is the value of x 4x-2= (-7) +5x. it would be greatly appreciated if someone could actually explain to me step by step