Half of a number is greater than or equal to 10."

I'd transcribe the word problem directly into an inequality, as follows:

(1/2) n is greater than or equal to 10. Mult. both sides by 2 results in

"n is greater than or equal to 20" (answer)

Draw a horiz. number line to represent n. Place a solid dot at x = 20. Draw an arrow from n=20 to the right. That's it.

1/2x>=10

(That's supposed to be a greater than or equal to sign)

That's your inequality. To solve:

x>=20

Now, your number line should have a dot on 20 that is colored in since it can be equal to 20. Then, draw a line extending from 20 to the right of 20 with an arrow since x can be greater than 20.