(i really need it) write these as algebraic expressions: a) a teacher had 54 pencils gave p pencils to each of his s students. how many pencils does he have left? b) in a party decorations total r balloons were used. there were b blue balloons, twice as many green balloons, and the rest of balloons were yellow. how many yellow balloons were used? c) after a teacher handed out m packs of notebooks with c notebooks in each pack, he has 13 notebooks left. how many notebooks did he have originally? d) total of a pounds of apples and b pounds of plums were packed into n boxes. how many pounds of fruit are there in each box? you!