C
given f(x) = 2x² - 4 , then
f(c) = 2c² - 4 = 28 (add 4 to both sides )
2c² = 32 ( divide both sides by 2 )
c² = 16 ( take the square root ob both sides )
c = ± = ± 4
Since the answer is looking for the positive solution then c = 4
Which square root is between 4 abd 5
2 answers:
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Number of girls at the time of the assembly started = w
Number of girls left = 40% of w
Remaining girls =
Now, the ratio of the number of boys to girls became 3 to 4.
Let n be the number of boys.
Then,
Or,
20n = 9w
or, n =
Total number of boys and girls =
Hence, the total number of boys and girs is