100=2^(t/28)

[pandora]

Намерете t ако
100=2^(t/28)

[S.B.]

Намерете t ако
100=2^(t/28)

[tex]100 = 2^{\frac{t}{28} }[/tex]
[tex]10^{2 } = 2^{ \frac{t}{28} }[/tex]
[tex]\lg 10^{2 } = \lg 2^{ \frac{t}{28} } \Leftrightarrow 2\lg 10 = \displaystyle \frac{t}{28}\lg 2 \Leftrightarrow 2 = \displaystyle \frac{t}{28}\lg 2 \Rightarrow t = \displaystyle \frac{2.28}{\lg 2}[/tex]
[tex]\Rightarrow t = \frac{56}{\lg 2}[/tex]