[tex]a {}^{b} \times a {}^{c} = a {}^{b + c} [/tex]
[tex]5 {}^{8} \times 5 {}^{ - 10} = 5 {}^{ - 2} = \frac{1}{5 {}^{2} } = \frac{1}{25} [/tex]
Correct answers are a,d, and f
