What system of measurement is most commonly used in the united states?

The variable in a relation who’s value depends on the value of the independent variable is called what?

Precalculus question, image attached.

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?