Wendy and rick left the library at noon and cycled 480 meters to the town hall . wendy cycled at a spees of 80 meters per minute. rick's speed was 20 meters per minute slower than wendy's. after cycling 0.25 of the distance wendy stopped and waited for rick to catch up with her. how many minute did wendy wait for rick show answer in minute

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