Explain how to simplify this expression: 4a + 19 - 3a - 7

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points

Plzz ! if you were constructing a triangular frame, and you had wood in the length of 4 inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking/show your work: