Question

Two times the sum of a number and 18 is at least -21

Answer 1

2x + 18 ≥ 21

x ≥ 2/3

Explanation:

Let sum be X

2 times the sum means 2x

the sum of a number and 18 means x + 18

at least -21 means ≥ 21

put them together, and you get, 2x + 18 ≥ 21

If solving for x,

2x + 18 ≥ 21

2x ≥ 3

x ≥ 2/3