In the figure above, right triangle PQR is similar to right triangle XYZ, with
vertices P, Q, and R corresponding to vertices X, Y, and Z, respectively.
If cos R=0.263, what is the value of cos Z?

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?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values