Please help with 43 as soon as possible

What is the area of the triangle 10 13 12

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.