Please please please help fx=√x+4+2 fx=x Solve the following system by using elimination or substitution.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.