NEED HELP ASAP A radioactive substance decays at a rate of 10% per hour. Which equation can you use to find the percent of the substance left after 3 hours?
A. F(3)=3(0.90)^1O
B. F(3)=10(0.90)^3
C. F(3)=100(0.10)^3
D. F(3)=100(0.90)^3

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