Dave runs a 10km race and beats his best time by 5%. His best time was 60 minutes.
How long did it take him to complete the race?

57 minutes

Step-by-step explanation:

Simply what is %5 of 60.

%5 of 60 can be found by multiplication by 0.05 x 60 giving you 3.

Remember that the vertex form of a parabola is where is the vertex of the parabola.

Now, to find the vertex of the parabola, we are going to use the vertex formula:

For a quadratic of the form , the vertex is given by:

in other words, we find by evaluating the function at

We know form our quadratic that and , so let's use our formula to find :

Now we can evaluate our function at to find :

Now, we can rewrite our parabola in vertex form:

, , and

We can conclude that the correct answer is: y = 6(x + 1)2 – 16