1) Angle A and Angle B are complementary angles. Angle A is (6x + 4) degrees. Angle B is (9y-10) degrees. Angle B and Angle C are vertical angles. Angle C is (6y + 2) degrees. Angle D has a value of (15x + 4). What
is the exact measure of Angle D? Which Angles, if any, is Angle D Supplementary to?

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

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