Question

"the sum of a number and 4."
answer?

Answer 1

Answer:

4+x

Step-by-step explanation:

$Let\: the\:unknown\:number\:be \:x\\\\= x +4$

Answer 2

Answer:

x + 4

Step-by-step explanation:

The sum - '+'

Of a number - 'x'

And four - '4'

The sum of a number and 4 would be 'x + 4'.

Hope this helps.