let the number = x
3 times a number(x) = 3x
Four more than 3 times a number is at least 22 can be expressed below
[tex]3x\text{ + 4 }\ge\text{ 22}[/tex]At least 22 simply means the lowest number is 22 or greater than 22. This means 3x + 4 is equals to 22 or greater than 22.
