(21 miles/gallon) x (21 gallons) = 21 x 21 = 441 miles
To simplify this:

You can factor the denominator and then cancel out some terms. But, this is not factorable. So, I think you are missing a term or you wrote this wrong.
Answer:
Polygons are figures that are formed by three or more line segments. These line segments, even called sides, meet at their endpoints to form vertices. If we compare the number of sides, diagonals and triangles of a quadrilateral a pentagon and a hexagon we can find a system between the different polygons.
Step-by-step explanation:
Answer:
Step-by-step explanation:
Notice that f(x) = ab would be a constant function, as 'x' does not appear on the right side. If 'a' were increased by 2, the magnitude of f(x) would be increased by a factor of 2. The domain of f(x) would not change; the range would be [a·(b+2)) (a single numeric value).
Answer:
(-1,0) (0,-1)
Step-by-step explanation:
I used a graphing calculator app called Demos. Sorry I can't anymore then this. Hope the graph helps though!