Hello,
well done.
As x^3-7x²-9x+63=(x-3)(x+3)(x-7) we must have x>3 and x>-3 and x>7 thus x>7
Explanations:
x^3-7x²-9x+63=x^3-9x+(-7x²+63)=x(x²-9)-7(x²-9)=(x²-9)(x-7)=(x+3)(x-3)(x-7)
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Answer:
yes
Step-by-step explanation:
any number is a difference
Answer: The function is even because 
.
Step-by-step explanation:
So, the function is even.
Answer:
14
Step-by-step explanation:
To find how many miles the submarine is going per minute, you need to divide the miles (56) by the minutes (4)
56/4 =
14 miles per minute
If the submarine has been descending for 1 minute, and descends at 14 miles per minute, you can conclude that it wend 14 miles below sea level in 1 minute.
