Abby was 5 feet 2 inches tall at the beginning of the school year. By February, she was 5 feet 8 inches tall. What is the percent increase in her height? Round to the nearest tenth.

9.7 %

Step-by-step explanation:

Step 1

The formula for Percentage increase = increase/Original Amount × 100

Increase = Current amount - Original Amount

= 5 feet 8 inches - 5 feet 2 inches

= 6 inches

Increase = 6 inches

Step. 2

Before calculating Percentage increase, convert original amount to inches for easy calculation

Hence:

Original amount = 5 feet 2 inches

1 foot = 12 inches

5 feet = x

Cross Multiply

x = 5 × 12 inches = 60 inches

Original amount = 60 inches + 2 inches = 62 inches

Percentage increase

= 6 inches/62 inches × 100

= 9.6774193548%

Approximately = 9.7 %

The percent increase in her height = 9.7%

Debbie

Step-by-step explanation:

Remember that

1 mile=5,280 ft

1 minute=60 seconds

In order to be able to compare all the speeds, we are going to unify the units to feet per second

we have

1) Debbie runs 15 feet per second

2) Liz runs 112 feet in 11 seconds

Divide the distance by the time to find the unit rate

3) Stephanie runs 1 mile in 411 seconds

Convert to feet per second

4) Tony runs 581 feet in 1 minute

Convert to feet per second

therefore

The fastest is Debbie because her speed is greater than the other runners.