[Effectively replace the old mysql_result without drastic changes.]

How can I effectively replace the old mysql_result? I've read the documentation but it seems I need to change a lot in the old code to make it work again with mysqli_*. Can someone clarify to me what should be done? And explain what is actually different? Your help will be appreciated!

Example 1

function time() {
global $db;
    $sql = "select time from table where id='$id'";
    $result = mysqli_query($db, $sql);
    return mysql_result($result, 0);
}

Example 2

function history() {
global $db;
    $sqlbc = "select count(DISTINCT user_id) from history and time>=DATE_SUB(CURDATE(),INTERVAL 10 MINUTE);";
    $rbc = mysqli_query($db, $sqlbc);
    $ten = mysql_result($rbc, 0, 0);
    mysqli_free_result($rbc);
}