D=(x2+x1)+(y2-y1) this is the formula I need number 19 Please will mark brainliest and 50 points

or

Step-by-step explanation:

The formula is actually d= . Now first, we have to find points A and C.

Point A is (1,2) and Point C is (-1,0).

Now we have to substitute the values in. That would make it d =.

To simplify the parentheses, it would get to d= .

To simplify the exponents, it would get to d = .

To simplify the square root, it would get to d = .

So the answer is either or .

Hope this helped! If not, please let me know!

multiple all that

step-by-step explanation:

27×17