Answer:
B, 
Step-by-step explanation:
Diagonals of a square are congruent so AC= 4
using pythagorean theorem we can then do
=

Then for perimeter we times the
by 4 and get

Hope this helps and please mark brainliest!!
Answer: A
Step-by-step explanation:
-12 is made positive so the equation is turned to 12-3 which is 9
Answer:
B) x = e^x
Step-by-step explanation:
The graphs of y = e^x and y = x never intersect, so the solution set will be the empty (null) set for ...
x = e^x
_____
There is one intersection of y=x with cos(x) and with sin(x). There are an infinite number of solutions for x = tan(x).