I need help with number one and two

Perform the indicated operation. 8/a - 6/a + 7/a

Lines p and q intersect. find the value of b. show your work. cite any theorems you use.

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