Use triangle ABC shown below to answer the question that follows: Which of the following is a step towards proving the similarity of triangles ABC and DBA?

I think it’s option A but I’m not sure.

Negative 5 1/12 + negative 4 1/4 + 6 3/4

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor