Answer:
(x+4)(x-8)
Step-by-step explanation:
Answer: First option.
Step-by-step explanation:
Given the equation
, you need to substitute
into this equation. Then:

Remember that the Addition property of equality states that:

Then, you can add "x" and 4 to both sides.
Therefore, you get the equation written in function notation, with "x" as the independent variable:

"Without using a calculator" suggests you are supposed to have memorized the square roots of 2 and 3 to at least 3 decimal places. That is, you know
21. √8 = √(2²·2) = 2√2 ≈ 2.83 . . . . about 4/5 of the distance between 2 and 3
22. √75 = √(5²·3) = 5√3 ≈ 8.66 . . . about 2/3 of the distance between 8 and 9
The total amount of tax on her purchases is $378.47