81=3^4
I hope this helps! Good luck!
Answer:
10 miles per hour.
Step-by-step explanation:
Let x represent athlete's walking speed.
We have been given that her jogging rate is 5 mph faster than her walking rate, so athlete's jogging speed would be
miles per hour.

10 minutes = 1/6 hour.
20 minutes = 1/3 hour
While walking, we will get 

While jogging, we will get 

Since athlete is covering same distance while walking and jogging, so we can equate both expressions as:

Cross multiply:




Therefore, athlete's walking speed is 5 miles per hour.
Jogging speed: 
Therefore, athlete's jogging speed is 10 miles per hour.
Assuming you meant the x2 as x squared, then:
(11x+4)(11x-4)
The answer would be : A parallelogram with congruent sides does NOT guarantee that a quadrilateral is a rectangle
-5
a^2-25=0
a^2=25
take the square root of both sides
a=5, and -5