A. 2 ft 5 in + 9 in b. 4 yd 8 in + 6 yd 6 in
c. 29 yd 2 ft 11 in + 55 yd 1 ft 10 in + 13 yd 1 ft 3 in
d. 4,839 sq yd 8 sq ft 139 sq in + 7 sq ft 124 sq in

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: #1 ads up by 8 and i don't know #2