I will give you a crown if it is right. Will you help me

First two diagrams

Step-by-step explanation:

In the following diagram, angles a and b are supplementary of they add up to 180 degrees. Since there aren't any angle measurements, we can visually check if two angles are supplementary by checking if they form a straight line. Looking at the different graphs, we see that a and b form a straight line only in the first and second graphs. Therefore, the angles a and b are only supplementary in the first two diagrams.

good luck on your studies! : )

david edward.

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