Set up a system of equations, and use it to balance the chemical equation for the given reaction.Fe3O4 and H2 react to produce Fe and H2O.
A. Fe3O4 + 4H2 ? 2Fe + 3H2O
B. Fe3O4 + 2H2 ? 3Fe + 2H2O
C. Fe3O4 + 2H2 ? 3Fe + 4H2O
D. Fe3O4 + 4H2 ? 3Fe + 4H2O
Answer: D
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Write the number in standard notation.7.753 x 10-5
A. -775,300 B. 0.00007753 C. 0.0007753 D. 0.000007753
Solve the problem.A person spent 1.1 h in a car going to an airport, 2.15 h flying in a jet, and 0.29 h in a taxi to reach the final destination. The jet's speed averaged 13.0 times that of the car, which averaged 19.0 mi/h more than a taxi. What was the average speed of each if the trip covered 1267.846 mi?
A. Car: 43.4 mi/h, jet: 564 mi/h, taxi: 62.4 mi/h B. Car: 24.4 mi/h, jet: 564 mi/h, taxi: 43.4 mi/h C. Car: 44 mi/h, jet: 565 mi/h, taxi: 24.4 mi/h D. Car: 43.4 mi/h, jet: 564 mi/h, taxi: 24.4 mi/h
Complete the table.
A. 
B. 
C. 
D. 
Solve the problem.After being struck with a hammer, a gong vibrates 66 vibrations in the first second and in each second thereafter makes 
as many vibrations as in the previous second. Find how many vibrations the gong makes before it stops vibrating.
A. 472 vibrations B. 77 vibrations C. 72 vibrations D. 462 vibrations