The linear combination method is applied to a system of equations: (4x + 10y = 12)One-half (10x + 25y = 30) – One-fifth 2x + 5y = 6 –2x – 5y = –6 0 = 0 What does 0 = 0 indicate about the solutions of the system? There are 0 solutions to the system. The solution to the system is (0, 0). There are solutions to the system at the x- and y-intercepts. There are infinitely many solutions to the system.

b. astronomers

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

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.

i believe it's a.

i'm not sure on this one, most likely correct.