The amount of caffeine at time 1 hours if there are 80 mg at the start and the quantity decays by 15% per hour.

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Adifferent website gives the cost for the first train as £56.88 and the second train as £20.11 with a £9.50 charge for cycle storage for the whole trip. how much would the journey cost you?

You have $600,000 saved for retirement. your account earns 5.5% interest. how much, to the nearest dollar, will you be able to pull out each month, if you want to be able to take withdrawals for 20 years?