Final answer:
The location of B' after the sequence of transformations is (5, -3).
Step-by-step explanation:
To find the location of B' after the sequence of transformations, we first need to perform the dilation by a scale factor of one-half about the origin. This means that each coordinate of B will be multiplied by 0.5. So, the new coordinates of B are (10 * 0.5, 6 * 0.5) = (5, 3).
Next, we need to reflect the triangle over the x-axis. This means that the y-coordinate of each vertex needs to be negated. So, the new coordinates of B' are (5, -3).
Therefore, the location of B' after the sequence of transformations is (5, -3).