Afair coin is flipped seven times. what is the probability of the coin landing tails up at least two times? a. 319/512 b. 15/16 c. 251/256 d. 219/256

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

what are the statments

step-by-step explanation:

not sure but it may be b, as i said i'm not sure.