Answer:
EASY. x=-3
Step-by-step explanation:
You need to divide 21 by -7. You'll get the same answer as me
Hope this helped!!
It is a percentage because it can be written as a fraction
Since it's a rectangle, each angle equals to 90 degrees, since total degrees 360 divided by 4 is 90 degrees.
So,

Answer : x = 45
Hope this helps. - M
X+y=-10/11 is in standard from