Don't answer if you don't know. 3x−8=8x+4/2

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

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.