For all objects hath skills
7. A rock at least falls ott a tall cliff and hits the
valley below after 3.5 s. What is the rock’s
velocity as it hits the ground
Critical Thinking

1) is right

step-by-step explanation:

207/8 is the right

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: your correct answer is b. d.

step-by-step explanation: