Question

From the Mathematics Diagnostic Assessment, using substitution to determine which value of x makes the inequality true:

2x < 18
A. 7
B. None of these
C. 36
D. 9

Answer 1

The value of x that makes the inequality 2x < 18 true is 9.

Step-by-step explanation:

The inequality is 2x < 18. To find the value of x that makes the inequality true, we can use substitution. Let's substitute different values of x and see which one satisfies the inequality.

• For x = 7, 2(7) = 14 which is less than 18.
• For x = 36, 2(36) = 72 which is greater than 18.
• For x = 9, 2(9) = 18 which is equal to 18.

Therefore, the value of x that makes the inequality true is 9. So, the answer is D. 9.