The answer is $6,000, because you multiply the 25,000 times .6 percent for interest, then multiply $15000 times .4 years and $6000 will be what you pay in interest.
Add 25 to both sides:

Square root both sides.
When you square root a perfect square, you will get a plus/minus result:



The other solution to this answer is x = -5.
That no matter what if you feel good about yourself you do better at what your doing. Hope I helped!
Radius = diameter/2 = 8/2 = 4m
Area of a circle = pi x r^2 = pi x 4^2 = 16pi m^2 ( exact area) or 50.27 m^2
Circumference = pi x diameter = 8pi m ( exact) or 25.12 m