1. Callie's grandmother deposits $1,000 into a savings account on Callie's 10th birthday for her to withdraw when she turns 21. The account carries a 2.5% annual interest
rate that compounds quarterly.
If no additional deposits are made the account, by how much will the money grow by
the time Callie turns 21?
you

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Acircle has a radius of 12.6cm what is the exact length of an arc formed by a central angle measuring 120