Please help me PLEASEE

Which must be true in order for the relationship △zyv ~ △xwv to be correct? zy ∥ wx ∠z ≅ ∠y and ∠w ≅ ∠x zv ≅ vy and wv ≅ vx ∠z ≅ ∠x and ∠w ≅ ∠y

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog