It's the mean of (2.57 x 10) minus 4
The mean is the average.
Answer:
The answer would be 204/25
Step-by-step explanation:
25 x 8 = 200
200 + 4 = 204
Thus, you get:
204/25
The correct answer is b. c=6k+55
He made a mistake in step #2. It seemed to be a trivial mistake because it involved signs, but it still had a great impact. Since step#2, his solution was already wrong.
Instead of
(-1)²-4(2)(-6) = 1 + 48 = 49
What he did is
(-1)²-4(2)(-6) = -1 + 48 = 47
