Jackson bought a water heater for $218 that was originally priced $436 what is the discount as a percentage

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning