4 years ago

21 fewer than two sevenths of students

Mathematics

1 answer:

zhenek [66]4 years ago

6 0

The expression is 2/7s-21
(s=students)
other than that i don’t understand your question
message me for help!!

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1 year ago

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aleksandr82 [10.1K]

Hi there! The answer is C. h = 6 or h = −7

${h}^{2} - 42 = - h$
Add h to both sides of the equation.

$h {}^{2} + h - 42 = 0$
First we need to find the discriminant (which can be found using the formula D = b^2 - 4ac)

$d = 1 {}^{2} - 4 \times 1 \times - 42 \\ d = 1 + 168 \\ d = 169$

Now we can plug in our found values into the quadratic formula.

$x = \frac{ - b - \sqrt{d} }{2a} \: \\ or \\ \: x = \frac{ - b + \sqrt{d} }{2a}$

Plug in.
$x = \frac{ - 1 - \sqrt{196} }{2 \times 1} = \frac{ - 1 - 13}{2} = \frac{ - 14}{2} = - 7 \\ or \\ x = \frac{ - 1 + \sqrt{196} }{2 \times 1} = \frac{ - 1 + 13}{2} = \frac{ 12}{2} = 6$

Hence, the answer is C. h = 6 or h = −7

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3 years ago

Read 2 more answers