Can you guide me through solving this problem: Jane planted a beanstalk in her backyard. After the first week, it was 3 inches tall. It doubled in height the second week. It grew another 4 inches in the third week. How tall was the beanstalk after 3 weeks?
It was 3 inches tall after the first week.
After the second week, it was 2 * 3 inches = 6 inches tall.
After the third week, it was 6 inches + 4 inches = 10 inches tall.