Answer:
it's the last one
Step-by-step explanation:
to find the perimeter, you must add all the sides.
25 plus 25 is 50
multiple x by two for both sides and that will give you the perimeter of 70
Answer:
Step-by-step explanation:
Alrighty
remember

means

and

and

for all real values of x
so

means

means

which simplifies to
1=x²+4x-5
minus 1 both sides
0=x²+4x-6
use quadratic formula or complete the square

and

2 solutions
Answer: n=p/2-m
Step-by-step explanation:
m=p/2-n (1)
Add n to both sides of the equation (1)
m+n=p/2-n+n => m+n=p/2 (2)
Subtract m from both sides of the equation (2)
m-m+n=p/2-m => n=p/2-m