Which statements regarding the diagram Triangle EBC are true? Select three options •Angle BEC is an exterior angle •Angle DEC is an exterior angle •Angle ABE and EBC are supplementary angles •Angle BCF and DEC are supplementary angles •Angle BEC us a remote interior angle to exterior angle BCF

answer: b.

step-by-step explanation:

the y coordinate for point b is 0, and answer b is the only one with that y coordinate.

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

idk

step-by-step explanation: