Question

2n +7 is greater than or equal to 27 or 3+3n is less than or equal to 30. What is n?

Answer 1

this is written as

`2n + 7 \geqslant 27`

change the greater than or equal to sign to equal to in order to solve it

thus

`2n + 7 = 27`

`2n = 27 - 7`

`2n = 20`

dividing through by 2

`(2n)/(2) = (20)/(2)`

`n = 10`

{
`{n:n \geqslant 10}`}