The number of seconds in a 7-hour school day can be calculated as follows —

A. 60 sec × 1 min 60 sec × 1 hr 60 min
Incorrect. When using dimensional analysis to solve a problem, always start with the given information.

B. 1 sec × 1 min 60 sec × 7 hr 60 min
Incorrect. When using dimensional analysis to solve a problem, always start with the given information.

C. 7 hr × 60 min 1 hr × 60 sec 1 min
Correct! This dimensional analysis calculation starts with the given information and uses the appropriate conversion factors.

D. 7 hr × 60 min 7 hr × 60 sec 60 min
Incorrect. Although the calculation starts with the given information, the conversion factors are incorrect.

If one liter equals 1.056 quarts, how many quarts would there be in 3.50 liters?

A. 3.314 quarts
Incorrect. Multiply 3.50 × 1.056 to find the number of quarts.

B. 3.696 quarts
Correct! The number of quarts is found by multiplying 3.50 × 1.056.

C. 3.017 quarts
Incorrect. Multiply 3.50 × 1.056 to find the number of quarts.

D. 4.556 quarts
Incorrect. Multiply 3.50 × 1.056 to find the number of quarts.

There are 5280 feet in a mile and 2.54 cm in one inch. How many cm are in .05 miles?

A. 670.56 cm
Incorrect. In your calculation, include the conversion factor of 12 inches = 1 foot.

B. 3168 cm
Incorrect. In your calculation, include the conversion factor of 2.54 cm = 1 inch.

C. 1247.24 cm
Incorrect. In your calculation, divide 5280 by 2.54 instead of multiply.

D. 8046.72 cm
Correct! Multiply .05 × 5280 × 12 × 2.54 to get the correct answer.

One calorie is equal to 4.18 joules. How many joules would 245 calories equal?

A. .01706 joules
Incorrect. Multiply 245 × 4.18 to find the number of joules.

B. 58.612 joules
Incorrect. Multiply 245 × 4.18 to find the number of joules.

C. 1024.1 joules
Correct! Multiply 245 × 4.18 to find the number of joules.

D. 249.18 joules
Incorrect. Multiply 245 × 4.18 to find the number of joules.