Write 9/10 - 3/10 as a mixed number

Which expression gives the area of the triangle shown below

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Darian wants to build a regulation size pool table that is 9 feet in length.he plans he ordered are 18 by 36 inches. what is the scale factor of the dilation he must use to build a regulation pool table