Question

Natalie wants to grow it 4 in. Longer than it is now. She knows that hair grows at an average rate of 15 cm/year. How many more months will she wait to have her hair cut? (1 cm ≈ 0.39 in.) Question 1 First, you will need to convert the rate of 15 cm/year to inches per month. Which two conversion factors should you use? Select all correct answers.

Answer 1

8.21 months.

Explanation:

The growth rate of hair, R = 15 cm/year

As 1 year = 12 months,

`\Rightarrow R=(15)/(12)` cm/month

As 1 cm ≈ 0.39 in.,

`\Rightarrow R= (15)/(12)* 0.39=0.4875` inch/month.

As she wants to grow it 4 inches longer than it now, So, the time required for 4 inches growth = 4/0.4875=8.21 months.

Hence, she needs to wait for 8.21 months.