Can someone please help me and put them in order ?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

X+y=-4 x-y=2 use elimination with adding and subtraction

Oliver read for 450 minutes this month his goal was to read for 10% more minutes next month if all of her medicine go how many minutes will you read all during the next two months