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21-12-2020
Mathematics

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Solve the inequality please- 21 ≥ 3(a- 7) +9 Thank you so much

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unicorn3125 unicorn3125

21-12-2020

Answer:

a ∈ (-∞, -3>

Step-by-step explanation:

- 21 ≥ 3(a - 7) + 9

- 21 ≥ 3a - 21 + 9

+21 +21

0 ≥ 3a + 9

3a + 9 ≤ 0

-9 -9

3a ≤ - 9

÷3 ÷3

a ≤ -3

a ∈ (-∞, -3>

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