Answer:
30n^15
multiply exponents add reg numbers
U do 4/20 = p/100 then u cross multiply the 4 with 100 getting u 400, then divide the 400 by 20, giving u the answer of 20%
11/15 because 3/5 converts to 9/15 so 9/15+2/15=11/15
What are you stuck on ??????
