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Which expressions are equivalent to [tex]-9\left(\frac{2}{3} x+1\right)[/tex]? Check all that apply.

- [tex]-9\left(\frac{2}{3} x\right)+9(1)[/tex]
- [tex]-9\left(\frac{2}{3} x\right)-9(1)[/tex]
- [tex]-9\left(\frac{2}{3} x\right)+1[/tex]
- [tex]-6 x+1[/tex]
- [tex]-6 x+9[/tex]
- [tex]-6 x-9[/tex]

Answer :

To determine which expressions are equivalent to [tex]\(-9\left(\frac{2}{3} x+1\right)\)[/tex], let's simplify and check each option step-by-step.

First, expand and simplify the expression [tex]\(-9\left(\frac{2}{3} x + 1\right)\)[/tex]:

1. Distribute [tex]\(-9\)[/tex] to both terms inside the parentheses:
[tex]\[
-9 \times \frac{2}{3} x + (-9 \times 1)
\][/tex]

2. Calculate each part:
- [tex]\(-9 \times \frac{2}{3} x = -6x\)[/tex]
- [tex]\(-9 \times 1 = -9\)[/tex]

3. Combine these results to get the simplified expression:
[tex]\[
-6x - 9
\][/tex]

Now, compare this simplified form [tex]\(-6x - 9\)[/tex] with the expressions provided:

1. [tex]\(-9\left(\frac{2}{3} x\right) + 9(1)\)[/tex]
- Simplifies to [tex]\(-6x + 9\)[/tex], which does not match [tex]\(-6x - 9\)[/tex].

2. [tex]\(-9\left(\frac{2}{3} x\right) - 9(1)\)[/tex]
- Simplifies to [tex]\(-6x - 9\)[/tex], which matches [tex]\(-6x - 9\)[/tex].

3. [tex]\(-9\left(\frac{2}{3} x\right) + 1\)[/tex]
- Simplifies to [tex]\(-6x + 1\)[/tex], which does not match [tex]\(-6x - 9\)[/tex].

4. [tex]\(-6x + 1\)[/tex]
- Does not match [tex]\(-6x - 9\)[/tex].

5. [tex]\(-6x + 9\)[/tex]
- Does not match [tex]\(-6x - 9\)[/tex].

6. [tex]\(-6x - 9\)[/tex]
- Directly matches [tex]\(-6x - 9\)[/tex].

Therefore, the expressions that are equivalent to the original expression [tex]\(-9\left(\frac{2}{3} x+1\right)\)[/tex] are:

- [tex]\(-9\left(\frac{2}{3} x\right) - 9(1)\)[/tex]
- [tex]\(-6x - 9\)[/tex]

These two expressions are equivalent to the original expanded and simplified form.

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