Vector u has a magnitude of 5 units, and vector v has a magnitude of 4 units. which of these values are possible for the magnitude of u + v?

Remember the triangular inequality says that if u and v are vectors then

Since the magnitude always is a nonnegative number and the magnitude of u is 5 units and the magnitude of v is 4 units ,

Then possibles values for the magnitude of u +v  are in the interval