Answer:
answer should be 52.4 mins
Step-by-step explanation:
find the midpoint for each time:
1. 15mins = 7students
2. 45mins = 27 students
3. 75mins = 12 students
4. 100 = 4students
Then, do the normal mean calculation by adding up all the values and dividing it by 50.
7*15 + 27*45 + 12*75 + 100*4 = 2620
2620/50 = 52.4mins
For this case we have the following equation:
f (x) = x ^ 2 + bx-49
Deriving we have:
f '(x) = 2x + b
We match zero:
0 = 2x + b
We clear x:
x = -b / 2
The axis of symmetry is at x = 8, therefore:
x = -b / 2 = 8
Clearing b:
b = -2 * (8)
b = -16
Answer:
the value of b is:
b = -16
A. first one is your answer.
To simplify, you just condense all of the values with the same variable, based on the signs of those values.
In this example,
6y + 5z + 8y - 3z
is the same as
6y + 8y + 5z - 3z
which can be simplified to
14y + 2z
which is the answer to your question.
Hope that helped =)
