Homework progress
77/ 105 marks
90%
there are 90 pupils at a primary school.
48 of the pupils are girls.
of the girls and of the boys play football.
complete the frequency tree.
1
plays football
1
does not
play football
00 00
boys
plays football
1
1
does not
play football

18

step-by-step explanation:

ik this stuph and i am smart donkey

answer: 0+0=0

step-by-step explanation:

that is the only answer that can make 0

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204