The sum of a geometric series is 2,621,430. The first term of the series is 10, and its common ratio is 2. How many terms are in the series?

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.