The numbers that can be expressed in the form of a fraction are called rational numbers. While that numbers that cannot be expressed in the form of a fraction are called irrational numbers.


is an irrational number, it cannot be expressed in the form of a fraction.
-16t^2+400=0
16t^2=400
take square root on both sides.

4t=20
t=20/4
t=5
First, you would need to create an equation for this problem.

=

Next, you would cross multiply.
5x = 8,000
Now, all you would have to do is isolate the x. To do this, you would divide both sides by 5.
x = <span>
1,6001,600 people are considered middle class. I hope this helps!</span>
There are four 6's and four 9's.
8/52
Answer:
x=10,−10
simple, it could be negative OR positive :D