A man cycles 12km to school every day at an average speed of 20km/h. On one particular day he cycled for a while, but then for a puncture. He walked the rest of the way at 4km/h. It took him an hour to get to school that day. How far did he walk?

sorry, i can't understand your question. will later if you describe more clearly!

: )

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

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