What is 245,600,000,000 in scientific notation

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

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?