Celsius: -20 Farenheit: -4

Celsius: -10 Farenheit: 14

Celsius: 0 Farenheit: 32

Celsius: 10 Farenheit: 50

Celsius: 20 Farenheit: 68

Celsius: 30 Farenheit: 86

Celsius: 40 Farenheit: 104

Array
(
    [0] => -20
    [1] => -10
    [2] => 0
    [3] => 10
    [4] => 20
    [5] => 30
    [6] => 40
)

Array
(
    [0] => -4
    [1] => 14
    [2] => 32
    [3] => 50
    [4] => 68
    [5] => 86
    [6] => 104
)

array(7) {
  [0]=>
  int(-20)
  [1]=>
  int(-10)
  [2]=>
  int(0)
  [3]=>
  int(10)
  [4]=>
  int(20)
  [5]=>
  int(30)
  [6]=>
  int(40)
}

array(7) {
  [0]=>
  float(-4)
  [1]=>
  float(14)
  [2]=>
  float(32)
  [3]=>
  float(50)
  [4]=>
  float(68)
  [5]=>
  float(86)
  [6]=>
  float(104)
}