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Area = length × width = \( 21 \times 8 = 168 \) square meters
#### 168
A car accelerates uniformly from rest to 60 miles per hour in 12 seconds. What is the acceleration in feet per second squared? (Note: 1 mile = 5280 feet, 1 hour = 3600 seconds)
Final velocity = 60 mph
Convert to feet per second:
\[ 60 \times \frac{5280}{3600} = 60 \times \frac{22}{15} = 4 \times 22 = 88 \text{ ft/s} \]
Acceleration \( a = \frac{\Delta v}{\Delta t} = \frac{88 \text{ ft/s}}{12 \text{s}} = \frac{88}{12} = \frac{22}{3} \approx 7.\overline{3} \) ft/s²
#### 7.33
The sum of the squares of three consecutive integers is 425. What is the smallest of these integers?
Sum of squares: