Mrs. fisher has 91 watches on display at her store she says she can arrange them into rows and columns without any watches leftover mr. fisher says that she can only make 1 row with all 91 watches who is right and why

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)