12^3 / 12^7 = 12^3-7
= 12^-4
Answer:
this is how u solve this
Step-by-step explanation:
Answer:

Step-by-step explanation:
This parallelogram contains a right angle. This tells us that the parallelogram is a rectangle.
The diagonals in a parralelogram bisect each other.
The diagonals in a rectangle are congruent.


Answer: 18
Step-by-step explanation: You would substitute x for 3 in the expression. This would equal 21-3, or 18 when simplified