The seven inner triangles in the picture are isosceles, as is the outer triangle. What is the measure of angle 21? Justify your response with work shown. helppp lol

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?

Find the value of x in each case. give reasons to justify your solutions! d q ∈ pr

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.