(2.5 × [tex] 10^{-10} [/tex] ) × (7 × [tex] 10^{-6} [/tex] )
First, simplify brackets. / Your problem should look like: 2.5 × [tex] 10^{-10} [/tex] × 7 × [tex] 10^{-6} [/tex]
Second, simplify. / Your problem should look like: 17.5 × [tex] 10^{-10} [/tex] × [tex] 10^{-6} [/tex]
Third, simplify exponent. / Your problem should look like: 17.5 × [tex] 10^{-15} [/tex]
Answer: B
