Final answer:
The estimate for 6.15 is 6, and the exact answer is also 6.
Step-by-step explanation:
To estimate the answer for 6.15, we can round it to the nearest whole number, which is 6. Then, to find the exact answer, we need to determine if 6.15 is closer to 6 or 7. Since 6.15 is greater than 6.1 but less than 6.2, it is closer to 6. Therefore, the exact answer for 6.15 is 6.