How tall is a stack of 100 pennies in centimeters

1. what is the measure of ∠abc? what is the measure of ∠abd?

Write an algebraic expression for the word expression the quotient of c and 8

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?