Final answer:
The best estimate of (-3/5)(17 5/8) is approximately -10.56.
Step-by-step explanation:
To estimate the product of (-3/5)(17 5/8), we can round -3/5 to -0.6 and 17 5/8 to approximately 17.6. Then, multiply these two numbers together: -0.6 * 17.6 = -10.56.