Construct the inequality for the following cases. Bina ketaksamaan bagi kes-kes berikut.
1.
The sum of x and y are less than 50.

Iknow #2 is d. i just need to know why

2. how is heavy water different from normal water

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests.which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory