The shape of a heart is reflected across the x -axis. If the point at the bottom of the heart for the original figure is at (3 1/4,7 1/2) , what are the coordinates for the point at the bottom of the heart in the reflected image?

When a shape is reflected across the x-axis, the x-coordinates of the points remain the same, but the y-coordinates are negated.

The original point at the bottom of the heart is (3 1/4, 7 1/2). To find the reflected image, negate the y-coordinate:
(3 1/4, -7 1/2)