Marie made a model (shown below) of the square pyramid she plans to build when she grows up. Find the surface area of the model.

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?

Plz hurry evaluate the expression a+b where a=8 and b=19

Need plz been trying to do it for a long time and still haven’t succeeded