Answer:
Scientific notation of the multiplication is 
Step-by-step explanation:

= 
[Since
]
= 
= 
Therefore, the scientific notation of the multiplication is 
Answer:
12x^2 + 8y -4
Step-by-step explanation:
(7x^2+3y-4) + (5x^2+5y)
= 12x^2 + 8y -4
Answer:
Step-by-step explanation:
$350 -$275= $75 profit
The system has one solution, x = 8, y = 3