It is c because it is I just did if give me Brainly
A difference is the result of a subtraction.
Call the number n.
"seven times a number": 7n
"eight more than four times the number": 4n + 8
"The difference between seven times a number and eight more than four times the number": 7n - (4n + 8)
Answer: 7n - (4n + 8)
$24
(ignore this i don’t have enough characters )
Answer:
The water temperature that produces the maximum number of salmon swimming upstream is approximately 12.305 degrees Celsius.
Step-by-step explanation:
Let
, for
.
represents the temperature of the water, measured in degrees Celsius, and
is the number of salmon swimming upstream to spawn, dimensionless.
We compute the first and second derivatives of the function:
(Eq. 1)
(Eq. 2)
Then we equalize (Eq. 1) to zero and solve for
:

And all roots are found by Quadratic Formula:
, 
Only the first root is inside the given interval of the function. Hence, the correct answer is:

Now we evaluate the second derivative at given result. That is:


According to the Second Derivative Test, a negative value means that critical value leads to a maximum. In consequence, the water temperature that produces the maximum number of salmon swimming upstream is approximately 12.305 degrees Celsius.
All you need to do for this is remove the parenthese and your answer will be
because that's the furthest it can be simplified.