Divide. Give the answer in scientific notation. $\frac { 2.25 \times 10 ^ { - 13 } } { 7.5 \times 10 ^ { - 6 } }$
A) $3 \times 10 ^ { - 9 }$
B) $3 \times 10 ^ { - 8 }$
C) $5 \times 10 ^ { - 7 }$
D) $7 \times 10 ^ { - 8 }$
E) $6 \times 10 ^ { - 8 }$

Question

Quizplus · Accepted Answer

To divide, we must subtract the exponents of 10 and divide the numerical coefficients. 
$$\frac { 2.25 \times 10 ^ { - 13 } } { 7.5 \times 10 ^ { - 6 } } = \frac{2.25}{7.5}\times 10 ^{-13-(-6)} =  0.3 \times 10^{-7}$$
We can simplify this by writing it in scientific notation as:
$$3 \times 10 ^ { -8 }$$
Therefore, the best choice is B.

Divide Give the Answer in Scientific Notation 2.25×10−137.5×10−6\frac { 2.25 \times 10 ^ { - 13 } } { 7.5 \times 10 ^ { - 6 } }7.5×10−62.25×10−13​

Divide Give the Answer in Scientific Notation $\frac { 2.25 \times 10 ^ { - 13 } } { 7.5 \times 10 ^ { - 6 } }$