The correct answer is: $7\text{ years}$
Explanation
84 months divided by 12 months per year equals 7 years exactly. If you want other units (days, weeks, hours), those are approximate because calendar months vary in length and leap years add extra days.
Steps:
- Convert months to years: $84 \div 12 = 7$.
- Approximate days using the average month length ($\approx30.436875\text{ days}$): $84 \times 30.436875 = 2556.6975\text{ days}$ (≈2557 days).
- Convert days to weeks and hours:
- Weeks: $2556.6975 \div 7 = 365.2425\text{ weeks}$ (≈365.24 weeks)
- Hours: $2556.6975 \times 24 = 61360.74\text{ hours}$ (≈61,361 hours)
Note: For a specific calendar range (e.g., Jan 15, 2019 to Jan 15, 2026) 84 calendar months will equal exactly 7 years, but the exact number of days depends on which months and leap years are included.