Perform the indicated calculation. Express your answer using scientific notation.
-$\left( 15 \times 10 ^ { - 5 } \right) \div \left( 3 \times 10 ^ { 4 } \right)$
A) $10 \times 10 ^ { - 9 }$
B) $5 \times 10 ^ { - 1 }$
C) $5 \times 10 ^ { - 9 }$
D) $10 \times 10 ^ { - 1 }$

Question

Quizplus · Accepted Answer

To divide powers of 10, subtract the exponent in the denominator from the exponent in the numerator. 
So, we have: $$\left( 15 	imes 10 ^ { - 5 } ight) \div \left( 3 	imes 10 ^ { 4 } ight) =  \frac{15}{3} 	imes 10 ^ {-5} \div 10^4 = 5 	imes 10^{-5-4} = 5 	imes 10 ^ {-9}$$
Therefore, the answer is choice C.

Perform the Indicated Calculation (15×10−5)÷(3×104)\left( 15 \times 10 ^ { - 5 } \right) \div \left( 3 \times 10 ^ { 4 } \right)(15×10−5)÷(3×104)

Perform the Indicated Calculation $\left( 15 \times 10 ^ { - 5 } \right) \div \left( 3 \times 10 ^ { 4 } \right)$