I need help plzz 18pts to anyone who can solve these

Ihave trouble finding the nth term of a linear sequence

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

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