Answer:
Is the last one He use his money to buy more equipment
The proper format is

No one really "said" it; it is the equation that represents Einstein's Theory of Relativity.
An information system is considered to be an interfaced system when it shares its data electronically with another system
Answer:
A constitution is an aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organisation or other type of entity and commonly determine how that entity is to be governed.