Create a $($:$p$:$)$ tag element using JavaScript, add the text "Hello World" to it$,$ and then append it to the page.

$($Hint: What methods do we use to create$/$append nodes from DOM?$)$

$2$ point

Remove the $($:$p$:$)$ tag element below from the page using JavaScript $($Hint: What methods do we use to remove nodes from DOM?$)$

$2$ point

Hello World

Complete the function isMobile$()$ that takes a phone number as a string and return whether it contains numbers only or not

$2$ point $($Hint$.$ Use regular expression$).$

function isMobile$($phone$)($

$\frac{8}{12}$