Help i need answers fasr plzzz

the answer is z<-4 the second graph on the picture

Step-by-step explanation:

-28/7=-4 and because its less than only not less than and equal to it's an open circle

b 1: 45 am

step-by-step explanation:

its that because if it was in the pm it would be 1345

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