Can 8 over 13 be simplified?

What does Ag mean as a name for silver? How do you change 18 over 9 to a mixed number? What percent of 15 is 63? What is the tangent equation of the circle 2x squared plus 2y squared -8x -5y -1 that touches the point of 1 -1 on the Cartesian plane? How many numbers of permutations in the word embarrass? What is 30 percent of 17900.00 dollars? What fraction of one minute is 53 seconds? What is complementry angles? A rate that has a denominatior of one unit? Does 17 go into 100? What is 2.428571 rounded to the nearest tenth? What does MCCL mean in roman numerals? When two real number lines that intersect at the right angle what is it called? Is Aadmi a jat name? What percent of 220 is 77? What do they mean by say to which gender each of the the underlined words belong? What is two 2grams? Does a circle have one curved line? Are circumcised penises smaller than uncircumcised ones? What does 12 pound 6 oz minus 7 pound 11 oz equals?