I honestly don’t even know where to start on his last 4 tests , Danilo scored 55% 78% 84% and 93%. What score should he get on the next test so that his average on all five tests is 80%?

The writing is like bold so i can’t see it well

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.