Use <,>, or = to make true number sentences without calculating. Explain your thinking. 2/3 x (9 + 12)
15 x 2/3

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 ?

Interpret the following expression (5y^2-7)^3/(2y)^2

Asource of laser light sends rays ab and ac toward two opposite walls of a hall. the light rays strike the walls at points b and c, as shown below: what is the distance between the walls?