What ratio equivalent to 12: 21 with lower terms

Which of the following parabolas opens down?

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?

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?