Seventy two(72), eighty six(86)
(74 + 78 + 70 + x) / 4 = 80
Divide each number by 4.
18.5 + 19.5 + 17.5 + x = 80
Add the numbers you know so far.
18.5 + 19.5 + 17.5 = 55.5
You need 24.5.
Now, since we divided all the others by 4, we have to multiply 24.5 by 4 to see what the exam score would be.
24.5 * 4 = 98.
To get an average of 80%, the student would need to get a 98 on their fourth exam.
Answer:
−4x+y+6z
Step-by-step explanation:
Let's simplify step-by-step.
2x+5y−z−6x−4y+7z
=2x+5y+−z+−6x+−4y+7z
Combine Like Terms:
=2x+5y+−z+−6x+−4y+7z
=(2x+−6x)+(5y+−4y)+(−z+7z)
=−4x+y+6z
10x + 2y = -2
2y = -10x - 2
y = -(10/2)x - 2/2
y = -5x - 1 y = mx + c, slope m = -5.
If it is parallel, then the slope of the second line ought to be -5 as well.
So you should fill -5 in the bracket.
If only the numerator or the denominator is negative then the whole fraction is negative.
