Willis constructed a horizontal shelf that extends perpendicularly from a wall and is held up by a 34-centimeter brace. The shelf makes a 28° angle with the brace as shown. To make the shelf, Willis began with a 55 centimeter piece of wood and then shortened it by cutting a portion off. About how many
centimeters did he cut off?
shelf
28°
34 cm
brace
wall

a: 1/6, j: 1/4

step-by-step explanation: you are welcome

i believe the answer is the polygon, heptagon.

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