Write the numbers in scientific notation and perform the operations. Give the answer in scientific notation and in standard notation. $( 85,000,000,000 ) ( 4,700,000,000 )$
A) $3.995 \times 10 ^ { 19 } , \quad 39,950,000,000,000,000,000$
B) $0.3995 \times 10 ^ { 20 } , \quad 3,995,000,000,000,000,000$
C) $3.995 \times 10 ^ { 20 } , \quad 399,500,000,000,000,000,000$
D) $0.3995 \times 10 ^ { 19 } , \quad 3,995,000,000,000,000,000$
E) $3.995 \times 10 ^ { 18 } , \quad 3,995,000,000,000,000,000$

Question

Quizplus · Accepted Answer

To multiply numbers in scientific notation, we multiply the coefficients and add the exponents. 
$$85,000,000,000 	imes 4,700,000,000 = 399,500,000,000,000,000,000,$$ which is written in scientific notation as $3.995 	imes 10^{20}$ and in standard notation as $399,500,000,000,000,000,000$. The only choice that matches this answer is C.

Write the Numbers in Scientific Notation and Perform the Operations (85,000,000,000)(4,700,000,000)( 85,000,000,000 ) ( 4,700,000,000 )(85,000,000,000)(4,700,000,000)

Write the Numbers in Scientific Notation and Perform the Operations $( 85,000,000,000 ) ( 4,700,000,000 )$