Answer:
10x + 2y - 20
Step-by-step explanation:
Answer:

Step-by-step explanation:
Using the rule of radicals
⇔ 
=
= 
Answer:
Case (c) has the lowest unit price and is thus the best buy.
Step-by-step explanation:
Example: (a) The unit price is the price paid divided by the weight:
$0.50
------------ = $0.2857/oz, or (to 2 decimal places) $0.29/oz
1.75 oz
(b) $1.00/(6 ounces) = $0.17/oz
(c) $1.88/(12 ounces) = $0.16/oz
Case (c) has the lowest unit price and is thus the best buy.