Solve.In a state with a population of 7,000,000 people, the average citizen spends $6,000 on housing each year. What is the total spent on housing for the state? Write your answer in scientific notation.
A. $42 × 1010
B. $4.2 × 109
C. $42 × 1011
D. $4.2 × 1010
Answer: D
Mathematics
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B. 
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Mathematics