What are the vertex and axis of symmetry of the parabola y = x2 – 16x + 63? A.
vertex: (8, -1); axis of symmetry: x = 8

B.
vertex: (8, 1); axis of symmetry: x = 8

C.
vertex: (-8, 1); axis of symmetry: x = -8

D.
vertex: (-8, -1); axis of symmetry: x = -8

A

Step-by-step explanation:

Remember that the x-value of the vertex when an equation is given in standard form can be found with the equation . So, we can take the coefficients from the equation and plug them in.

Now we know that the x-value of the vertex is 8. Next, the equation for the y-value is , where h is the x-value of the vertex (8).

So the vertex is (8,-1).

Finally, the axis of symmetry is the x-value of the vertex, also called h.

Final answer, vertex: (8,-1) and axis of symmetry: x=8

Hope this helps!

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,