To simplify 8.3 − 4 15(6.1 + 12) , which operation must be performed first

You put the following items into your rucksack. ham 600 g cheese 380 g tomatoes 270 g how much do all the ingredients weigh in total?

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?