Raul149
contestada

Which shows the expression below simplified? 0.00028 ÷ (7 × 10-4)
a. 4 × 100
b. 4 × 10-1
c. 4 × 10-2
d. 4 × 101

Respuesta :

[tex]0.\underbrace{00028}_{\rightarrow5places}=28\times10^{-5}\\\\0.00028:(7\times10^{-4})=\dfrac{28\times10^{-5}}{7\times10^{-4}}=\dfrac{28}{7}\times\dfrac{10^{-5}}{10^{-4}}\\\\=4\times10^{-5-(-4)}=4\times10^{-5+4}=\huge\boxed{4\times10^{-1}}\leftarrow\boxed{b.}\\\\used\ \dfrac{a^n}{a^m}=a^{n-m}[/tex]

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