What do we call a pure sample that's run next to the tested substance to see if it's a component in the mixture?.

What is the answer to this question?

Felipe is saving money for a class trip. he already has saved $ 2 5 0 $250 that he will put toward the trip. to save more money for the trip, felipe gets a job where each month he can add $ 3 5 0 $350 to his savings for the trip. let m m be the number of months that felipe has worked at his new job. if felipe needs to save $ 2 7 0 0 $2700 to go on the trip, which equation best models the situation?

Trey caught a five and a half pound fish. how much did it weigh in ounces?