Please help!! I already missed two!

30,40,50

Step-by-step explanation:

We use the Pythagorean theorem to find out if they would be sides of a right triangle

the Pythagorean theorem states that the two shorter sides squared added together equal the longest side square

for 30, 40 , 50

2500=2500 therefore that is the correct answer

since no one answered yet i will give it a shot, not completely sure tho.

i think it should be y=cos(x+2pi), (third answer, answer c)

good luck.