Transversal t cuts parallel lines r and s. Which angles must be congruent to ∠2? A. ∠3, ∠6, and ∠7 B. ∠7 only C. ∠7 and ∠6 D. ∠3, ∠5, and ∠6

Really need on these. i have no idea what to do

Listed in the table is the percentage of students who chose each kind of juice at lunchtime. use the table to determine the measure of the central angle you would draw to represent orange juice in a circle graph

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]