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
Answer:
(4,-2)
Step-by-step explanation:
plug in and simplify;
y+2=-3(x-4)
-2+2=-3(x-4)
0=-3x+12
3x=12
x=4
0.5 because 50 is 1/2 of 100.
Answer: 7,044.6
Step-by-step explanation:
35223/5 = 7,044.6
10)

11)

12)

13) (your answer is incorrect)

14) (your answer is incorrect)

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16)
-expression to represent this situation

Answer: In 1 group 57 students
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P.S. Hello from Russia :^)