##### Alister Doyle, Math makes my head hurt.

If a number is AT LEAST thirteen it must be greater than or equal to thirteen:

2x + 10 >= 13

If a number is AT LEAST thirteen it must be greater than or equal to thirteen:

2x + 10 >= 13

If a number is AT LEAST thirteen it must be greater than or equal to thirteen:

2x + 10 >= 13

If a number is AT LEAST thirteen it must be greater than or equal to thirteen:

2x + 10 >= 13

If a number is AT LEAST thirteen it must be greater than or equal to thirteen:

2x + 10 >= 13