Answer:
B
Step-by-step explanation:
Multiplying numbers with exponents rule:
[tex] {a}^{b} \times {a}^{c} = {a}^{b + c} [/tex]
Explanation of rule: keep the base the same and add the exponents. Keep in mind this rule only works when the base of both numbers are the same.
Applying rule: 8^-3 x 8^-9
keep base as 8 and add the exponents
[tex] {8}^{ - 3} \times {8}^{ - 9} = {8}^{( - 3) + ( - 9)} = {8}^{ - 12} [/tex]
b is the answer
