My back is killing me. how do i fix this shjit

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

Drag each tile into the correct box. not all tiles will be used. find the tables with unit rates greater than the unit rate in the graph. then tenge these tables in order from least to greatest unit rate

In a timed typing test lara typed 63 words per minute.estimate the number of words she should be able to type in half in hour show your work