Answer:
x
0
Step-by-step explanation:
You need each of the square roots to be positive numbers, and the only for that to happen is if the variable is 0 or a positive number.
Answer: 
Work Shown:
I'm assuming your teacher wants you to factor as much as possible.

In the last step, I used the rule that 
We cannot factor any further. If the first term was
instead of
, then we could use the difference of squares factoring rule.
Answer:
$52.324
Step-by-step explanation:
Answer:
2
Step-by-step explanation:
;\
Answer:
$719.95
Step-by-step explanation:
To find the purchase total, multiply the price by the percent paid and add the percent of tax.
The store offers a 20% discount. This means you pay 80% of the price. So the discounted price is 0.80(849) = 679.2.
Find the tax to be paid by multiplying 0.06(679.2) = 40.752.
Add the tax for the final total.
679.2 + 40.752 = 719.95