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leannamat2106
21.08.2019 •
Mathematics
If a number is added to the numerator of 4/9 and the same number is subtracted from the denominator the result is -9. find the number
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Ответ:
You said that (4 + x) / (9 - x) = -9
Multiply each side by (9 - x) : (4 + x) = -9 (9 - x)
Eliminate parentheses: 4 + x = -81 + 9x
Add 81 to each side: 85 + x = 9x
Subtract 'x' from each side: 85 = 8x
Divide each side by 8 : 85/8 = x (or 10.625)
Ответ:
4+n=-9(9-n)
4+n=-81+9n
4+81=9n-n
85=8n
n=85/8=80/8+5/8=10+5/8
Ответ:
D. the circumference of the base of the cylinder.
Step-by-step explanation: