Will give a

the graph of a quadratic function is a parabola that opens down and has a vertex of (4, 3). which of the following could be the function?

a.
y=-x^2+4x+3
b.
y=-x^2+8x-13
c.
y=x^2-4x+3
d.
y=x^2-8x-13

Step-by-step explanation:

We know that the vertex of the parabola is

That means this points is being intercept by the parabola. In other words, the function that represents this parabola has to have this relation, when , .

So, you can observe that the second choice has a function that follows this relation. Let's see

So, for

Therefore, function B is the answer because it includes the vertex at its relation.

18a

step-by-step explanation:

simply because it is. it's the highest common factor

all but the second one

step-by-step explanation:

cuz that one goes over 180

mark brainliest