Given a rhombus is special type of trapezoid, which of the following shows the formula to find area of a trapezoid correctly filled in?

1/2 h (b1+b2)

Step-by-step explanation:

A rhombus is a special type of trapezoid.  

Bases are b1 and b2 and height is h

Applying the same formula for trapezium,

we get area of a rhombus

= 1/2 h (b1+b2)

So answer is

area of a rhombus =  1/2 h (b1+b2)

where h is the height and b1 and b2 are one pair of parallel sides

(h is the distance between the pair of parallel sides)

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: 5

step-by-step explanation: