Question

when a certain number is doubled and then decreased by 9, the result is not more than 19. Find the range of values of the number​

Answer 1

The number must be at most 10.

If the number is doubled and then decreased by 9, the result is 2x - 9.

2x - 9 ≤ 19

2x ≤ 28

x ≤ 14

Therefore, the range of values of the number is 0 to 10.