need help please and please dont give me a file just tell me what the answer is and how u got it plzz

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

When are triangles considered similar? a. corresponding angles are equal andcorresponding sides are proportionalb. corresponding angles are proportional andcorresponding sides are equalc. corresponding angles are equal orcorresponding sides are proportionald. corresponding angles are proportional orcorresponding sides are equal select the best answer from the choices providedmark this and retumsave and exitnext