Free 50 points 13 one btw and please hep

Free??

Step-by-step explanation:

answers are in bold

Step-by-step explanation:

speed=distance/time

I have done it all in hours not in seconds

1)12.5/0.5= 25m/h

2) 25/1= 25m/h

3) 37.5/1.5= 25m/h

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation:

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