X+ 2y = 10

3x + 4y = 8

which point is the solution to the system of equations?

a)
(7, 1.5)

b)
(11,-12)

c)
(-11, -12)

d)
(-12, 11)

answer: no

step-by-step explanation:

you are only given the cost not the amount of pounds.

a is the right answer

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