AMO 2027 Grades 9-11 SET 3 - Self-study Question 12

Two vectors in three-dimensional Euclidean space are $4\hat\imath+9\hat\jmath-13\hat k$ and $7\hat\imath+6\hat k+5\hat\jmath$, where $\hat\imath,\hat\jmath,\hat k$ are the standard mutually perpendicular unit vectors. Find their dot product.

Choose one option.