Answer:
$8502
Step-by-step explanation:
you need to gather a compilation of prices and add them all up. You then divide that total by the number of prices you gathered.
Cant see the rest of the question ;-;
Answer:

Step-by-step explanation:

Move 3k to left hand side and change it's sign
Similarly, move 4.5 to right hand side and change it's sign

Collect like terms

Subtract 4.5 from 18

Divide both sides by 4.5

Calculate

Hope I helped!
Best regards! :D