Answer:

Step-by-step explanation:
Factor using the perfect square rule.
:)
I think what you mean is:

Then using our rules of exponents, this is the same as
60 miles per hour. In two miles the sum of the distance the two trains traveled was 200 miles, you divide that by 2, the sum of the speed of the two trains is 100 miles per hour, now put the speed of the slow train as x and the fast as x +20, the sum of x and x +20 is 100, so 2x + 20 =100, you subtract 20 from both sides, 2x = 80, divide by 2, x = 40, the problem asks for the speed of the fast train, so, x + 20 is 60.
Technically it's 2x subtracted by 1 and 8 more than that so:
(2x-1)+8
The smallest decimal is 0.019