1.4.

R = R_{0} (1 + α t)

${R = R_0(1 + \alpha t)}$

R = R_{0} (1 + α t)

$R = R_0(1 + \alpha t)$

R

$R$

R_{0}

$R_0$

R_{0}

$R_0$

1

α

$\alpha$

1

t

$t$

1

Lisa