What is the area of a triangle with a base of five units and a height of 15 units

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

Yes. there is a constant ratio of number of calories to gram of protein.12/3=24/4=32/8=44/11=4