Answer:
Step-by-step explanation:
<u>Standard form is:</u>
<u>Given</u>
<u>Converting to standard form</u>
Correct option is the first one
Answer: The mechanics spent about 8.5 hours working on the car
Step-by-step explanation: The total bill was $637, a portion of that being getting the parts which was $280. 637-280=357
357/42=8.5
3x+y=18
3xy=18
xy= 18/3
xy=6