PLEASE HELP !! UNIT TEST

The correct ans of your question is 21.

Step-by-step explanation:

2x-1=13

or,2x=13+1

or,2x=14

Therefore,x=7

If we put the value of x=7 in expression -x^2-4x

(-7)^2-4*7

=49-28

=21

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1

i got 86 for this

hope this !

if you need an explanation just ask