Solving proportions 10/8=n/10

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

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.)

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.