You need to read your homework better if you want us to do it for you. We'd need the previous numbers or some clue.
4 looks vaguely like a triangle though and delta (but that's not typically a number).
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21, 28, 36, 45
None. There is nobody to whom triangular numbers belong.
It is necessary to know which of three of the four given numbers are the sides of the triangular cross section and which one in the length. Without that information it is not possible to answer the question.It is necessary to know which of three of the four given numbers are the sides of the triangular cross section and which one in the length. Without that information it is not possible to answer the question.It is necessary to know which of three of the four given numbers are the sides of the triangular cross section and which one in the length. Without that information it is not possible to answer the question.It is necessary to know which of three of the four given numbers are the sides of the triangular cross section and which one in the length. Without that information it is not possible to answer the question.
The difference between the successive numbers is 4. so the next three numbers could be 4, 0 and -4.
Nope Triangular numbers are 1,3,6,10,15,21,28,36