How to simplify expressions eg: 10 to the fourth power divided by 10 to the 6th power

Which rational number could be graphed between -4 and -5

What are “like terms”? why can we only add like terms?

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle