Few math questions TIME IS RUNNING OUT!! PLEASE HELP!!!!

Mathematics

1 answer:

olya-2409 [2.1K]4 years ago

3 0

1.

$|5+6x|\ \textless \ 13\\\\-13\ \textless \ 5+6x\ \textless \ 13$

so

$\begin{cases}5+6x\ \textless \ 13\\5+6x\ \textgreater \ -13\end{cases}$

Answers B and D.

2.

$|x+9|\geq11\\\\x+9\ \textgreater \ 11\qquad\vee\qquad x+9\leq-11\\\\
\boxed{x\geq2\qquad\vee\qquad x\leq-20}$

Answer D.

3.

The same as point 2. Answer D.

4.

Answer C.

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What is the solution to the inequality |2n+5|>1?

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ANSWER

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EXPLANATION

The given inequality is,

$|2n + 5| \: > \: 1$

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We divide through by negative 1, in the first part of the inequality and reverse the sign to get,

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We simplify now to get,

$2n \: < \: - 1 - 5 \: or \: 2n \: > \: 1 - 5$

$2n \: < \: - 6 \: or \: 2n \: > \: - 4$

Divide through by 2 to obtain,

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Answer:

0.0035289

Step-by-step explanation:

From the question;

mean annual salary = $63,500

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Standard deviation = $6,200

Firstly, we calculate the z-score of $60,500

Mathematically;

z-score = x-mean/SD/√n = (60500-63500)/6200/√(31) = -2.6941

So we want to find the probability that P(z < -2.6941)

We can get this from the standard normal table

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Im really confused i hope this doesnt take to much time please help it would me so much to me.

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Yes it is A I got it right

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The brand manager for a brand toothpaste must plan a campaign designed to increase brand recognition. He wants to first determin

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