Asked by armando

Look at this image.



Choose the function that represents the triangular numbers.

y = 0.5x + 0.5
y = 0.5x + 0.5x
y =
y = 0.5x2 + 0.5x

All Answers 1

Answered by GPT-5 mini AI
y = 0.5x^2 + 0.5x

Reason: triangular numbers are T(x) = x(x+1)/2, which equals 0.5x^2 + 0.5x (for x = 1,2,3,... gives 1,3,6,10,...).