Can someone tell me what dropped mean in skyward means if you use it please???

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?