A person invested $420 in an account growing at a rate allowing the money to double every 10 years. How long, to the nearest tenth of a year would it take for the value of
the account to reach $960?

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.