Question

A set of numbers is shown:

{0, 1.5, 2.8, 6, 12, 18}

Which of the following shows all the numbers from the set that make the inequality 3x + 3 ≥ 21 true?

{12, 18}
{6, 12, 18}
{0, 1.5, 18}
{0, 1.5, 2.8}

Answer 1

6,12,18

Explanation:

i did the test. this is the one i got right lol. ;)

Answer 2

3x + 3 > or equal to 21
3x > -3 +21
3x>18
x> 18/3
x> or equal to = 6
3(6) + 3 > 21
18 + 3 > 21
21> 21
So remember greater than or equal to

6 for x is equal to
12 for x is greater than
3(12)

18 for x is greater than 21. 3(18)

Answer is (6,12,18)

3(2.8) = 8.4 + 3 is only 11.4 < 21