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antiseptic1488 [7]
3 years ago
14

2x+30=5x+9 Solve for x O 6 0 -7 O -6 What’s the answer please?

Mathematics
2 answers:
dmitriy555 [2]3 years ago
5 0

\text {Hey! Let's Solve this Equation!}

\text {\underline {The First Step is to Subtract 2x}}

\text {2x+30-5x=5x+9-5x}

\text {Your New Problem Is: -3x+30=9}

\text {\underline {The Next Step is to Subtract 30}}

\text {3x+30-30=9-30}

\text {Your New Problem Is: -3x=-21}

\text {\underline {The Final Step is to Divide -3}}

\text {-3x/-3=-21/-3}

\text {Your Answer Would Be:}

\fbox {x=7}

\text {Best of Luck!}

Maksim231197 [3]3 years ago
4 0

Answer:

7

Step-by-step explanation:

get the x on the same side.

subtract 2x from both sides

30=3x+9

then get the variables on one side by themselves. subtract 9 from both sides.

21=3x

now divide by 3 on both sides.

there's your answer.

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STEP-BY-STEP EXPLANATION:

Given:

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\begin{gathered} \alpha=100\%-95\%=5\%=0.05 \\  \\ \alpha\text{/2}=\frac{0.05}{2}=0.025 \\  \\ \text{ The corresponding Z value for \alpha/2 = 0.025 is as follows:} \\  \\ Z_{\alpha\text{/2}}=1.96 \end{gathered}

Now, we calculate the minimum value of the sample size as follows:

\begin{gathered} n=\left(\frac{Z_{\alpha\text{/2}}\cdot\sigma}{E}\right)^2 \\  \\ \text{ We replacing:} \\  \\ \:n=\left(\frac{1.96\cdot 700}{135}\right)^2 \\  \\ \:n=103.2858\cong104 \end{gathered}

The minimum sample size needed is 104

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