Answer:
There are 24 total students.
Step-by-step explanation:
To find the students, we need to take the number of boys and divide by the percentage of which are boys.
18/75% = 24
3x - y =7
y= -3x + 7
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I must assume that you meant <span>X^2-10x =7. If that is indeed the case, then:
</span>X^2-10x =7 => x^2 -10x + 25 - 25 = 7, so that (x-5)^2 = 32 (Add 25, then
subtract 25)
Then x-5 = plus or minus sqrt(16)sqrt(2) = 4sqrt(2).
Then x = 5 plus or minus 4 sqrt(2) (answers)