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The Area of the Trapezoid is 49 square Kilometres.

Step-by-step explanation:

a = 5 km

b = 9 km

h = 7 km

Area = ?

Now, Area of Trapezoid

A = (a + b/2) × h

A = (5 + 9/2) × 7 km

A = (14/2) × 7 km

A = 7 × 7 km

A = 49 square Kilometres

Thus, The Area of the Trapezoid is 49 square Kilometres.

-TheUnknownScientist 72

the area is 49 km square

Step-by-step explanation:

hope it's helpful

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