D3+(A3-B3) If you think of the future income and expenses then you can infer the expenses will lower the income amount so we use parenthesis and since there is money already in the account you would simply add that to the future total. <span />
It is a program that may be used by a user to access files and navigate the World Wide Web. An example of this would be Firefox, Chrome, Safari, etc.
I think it's D because it's made out of facts. The other ones are more likely to include bias.
* Main Electron a component- vacuum tube.
* Main memory- Magnetic drums and magnetic tapes.
* Programming language- Machine language.
* Power- Consume a lot of electricity and generate a lot of heat.
* were expensive to operate
