The students of litchfield High school are in grades 9,10,11,12. Of the students , 1/4th are in 9th grade, 1/3rd are in 10th grade, 1/6th is in 11th grade and there are 300 in the 12th grade, how many students are there all together?

let total no of students=T

so in 9th class= T/4
in 10th class=T/3
in 11th class=T/6
so in 12th class=T-[(T/4)+(T/3)+(T/6)]
= T/4
and is given that, students in 12th class= 300
so total students in school= 300*4=1200

Help meh plz with this...

Find the second derivative of the polynomial.
f(x)=14x2
Write your answer as a polynomial in x or as a constant. Simplify any fractions.
f′′(x)=

Let AT be all together.

1/4 AT+ 1/3 AT + 1/6 AT + 300=AT
3/12 AT + 4/12 AT + 2/12 AT+300=AT
9/12 AT +300=AT
solve for AT

need help on hspa

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9th grade 300

10th grade 400
11th grade 200
12th grade 400
all together 1200 students

1200

4x-12/4x