Yuki's guppies have begun to have babies. she started with 5 guppies. one week later, yuki counted twice as many guppies in the fish tank. each week afterwards, the number of guppies doubled. in how many weeks did yuki have 160 guppies?

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.