Final answer:
To plot the solution to the inequality 10r + 10 < -10 on a number line, the solution is represented as an open ray to the left of -2.
Step-by-step explanation:
To plot the solution to the inequality 10r + 10 < -10 on a number line, we need to solve the inequality first:
10r + 10 < -10
Subtracting 10 from both sides:
10r < -20
Dividing both sides by 10:
r < -2
The solution to the inequality is r < -2, which means that any value of r less than -2 satisfies the inequality. On a number line, we represent this solution as an open ray to the left of -2, since -2 is not included in the solution.