AS Maths Modelling help pleaseWatch
A car manufacture uses a model to predict the fuel consumption, y miles per gallon(mpg), for a specific model of car travelling at a speed of x mph.
Y= -0.01x^2 + 0.975x+16, x>0
Question: use the model to find two speeds at which the car has a fuel consumption of 32.5mpg...
Answer: 21.8 and 75.7
Make it a quadratic equation so one side = 0, and solve using the quadratic formula.
This thread is 3 years old and I have no idea what is about it but, from what your answers are you put the numbers incorrectly into the formula
Its funny how one sign can make such a difference.
thanks anyways though.