What's missing from this sequence of numbers? 4, 8, 12, 20, 52?

To solve this problem you must apply the proccedure shown below:

1. You have the following sequence of numbers given in the problem above:

2. As you can see, the third term is the sum of the first term and the second term, then, the missing one , which is the fifth term, must be the sum of the third term and the fourth term:

3. Therefore, when you sum the fourth and the fith term, you obtain the last one:

The answer is:

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1

k

step-by-step explanation:

domit