Is 2.9 greater than 2.90

What is the result of adding the system of equations? 2x+y=4 3x-y=6

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.