Answer:
6
scale factor b to A = 4
Explanation:
scale factor
We multiply the scale factor times the original figure length to get the new figure length
x * scale factor = 1.5
The scale factor is 1/4
x * 1/4 = 1.5
Multiply each side by 4 to get rid of the fraction
x * 1/4 *4 = 1.5 * 4
x = 6
The scale factor from figure B to figure A
1.5 * scale factor = 6
scale factor = 6/ 1.5
scale factor = 4