Complete a distribution and read inequalities

The discrete random variable $Y$ has probability distribution

$y$	$-3$	$-2$	$-1$	0	1
$P(Y=y)$	0.1	0.3	$d$	0.25	0.01

Find (i) $d$, (ii) $P(-3\le Y<0)$ and (iii) $P(Y>-1)$.