Answer:
The equal sign "=" must be used.
Most, if not all, spreadsheet programs support formulas, but you must start them with an equal sign.
Answer:
optical sensors
Explanation:
optical sensors measure the amount of gases like carbon dioxide and carbon monoxide in the air
Answer TCP/IP is the most common protocol in Local Area Networks.
The correct answer is protocols.
Protocols are rules and instructions as to how devices should function. Each of these devices has its own protocols about its inner workings that regulate how that particular device is going to work and function in real life. Without these protocols, the device wouldn't be able to work.
Assuming you're running Windows, click the start button, and then search for "Device Manager" (or open CMD or PowerShell and type devmgmt.msc). Look at the list of devices. If Bluetooth is there, you have it; if it's not there, you don't.