So I use the formula hopefully these steps work
Answer:

Step-by-step explanation:
The domain is all possible values for x.

There are no restrictions on x.
The domain is all real numbers.
Answer: A. contains a number and a unit
Step-by-step explanation:
Quantitative observations measure the quantity, or the amount, of a certain thing. Therefore they must always use a number value to measure the amounts, and a unit to signify what the amount is for.
Answer:
QS = 8x - 2
Step-by-step explanation:
QS = QR + RS
QS = 6x - 11 + 2x + 9
QS = 8x - 2