Dutt Dett

let element = document.querySelectorAll("p")[0];
   element.innerHTML="new text";

$lg: 720px;

@mixin _lg {
  @media (min-width: $lg) {
    @content;
  }
}

.tt {
color: red;
@include _lg {
      color: green;
    }
}

$sum = 0;
for ($i = 9; $i <= 40; $i++) {
    if ($i % 2 === 0) {
        $sum += $i;
    }
}
echo "Сумма: $sum" . PHP_EOL;

$i = 9;
 while($i <= 40){
  $summa[] = $i += 1;
  $i++;
 }
echo implode(' + ',$summa).' = '.array_sum($summa);

10 + 12 + 14 + 16 + 18 + 20 + 22 + 24 + 26 + 28 + 30 + 32 + 34 + 36 + 38 + 40 = 400