For every 19 litres of petrol a car can run for 50 km. How much petrol do you need (to 1 DP) to ensure the car has enough petrol of a trip that is 130 km?

The car will use at least 1/3 more fuel while warming up. Stops and starts will dramatically increase its fuel consumption, as well.

Step-by-step explanation:

c. (3,2,6) is the answer.

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