PLEASE HELP SOLVE THIS ASAP (IT WILL BE VERY MUCH APPRECIATED)
algebraically simplify the following expressions.
a) (x+3)(2x-4)-(3x-1)^2
b) 9+2(3x-7)(2x^2-3x+1)

Which equation represents the partial sum of the geometric series?

Acertain population of bacteria demonstrates exponential growth doubles in size every 4 days. how long will it take the population to triple in size?

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem