U subtract 4x by 5x and then you add 3 by -21 and the answer is x=18
It goes in 5 times but with 1 remainder
A triangle that has an angle that measures 90 degrees would be a Right Triangle.
(x - 7)² + (y - 3)² = 4 is your equation.
For the first one we see that the shape is that of a parabola and is translated down a few units, We can eliminate linear, exponential
and looking at the general shapes of quadratic and polynomial functions we can conclude that the graph is from a quadratic equation
So Answer is: (2) quadratic
I hope that helps