Which of these would be a good reason to use scientific model? (a) to use up extra research money (b) to replace a prototype with something better (c) to make a scientific idea more understandable (d) to keep scientists from getting bored when they work

Grading scale 1 has the following weights- (tests- 50% quiz- 25% homework- 15% final exam- 10%). calculate your final average if your performance in the class is as follows-test grades- {88, 84, 90, 75, 70, 81); quiz grades- {88, 67, 90, 90, 45, 99, 76, 98, 100}; homework- 90; final exam- 75