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3 years ago

I need help you don't have to explain the answer I just need it, thank you!

Mathematics

1 answer:

denpristay [2]3 years ago

6 0

Answer:

j = 10

Step-by-step explanation:

You add 7 to both sides then divide both sides by -2

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:The height of the building is 30ft

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4 years ago

Read 2 more answers

Using the properties of inequalities, write down the inequality that you will get if you: add the number –5; 2.7; 7; to both sid

puteri [66]

Answer:

See below

Step-by-step explanation:

1..........................

18 >−7

Add –5; 2.7; 7 to both sides

18 -5 > -7 - 5 ⇒ 13 > -12
18 + 2.7 > - 7 + 2.7 ⇒ 20.7 > - 43
18 + 7 > -7 + 7 ⇒ 25 > 0

2..........................

5 > -3

Subtract 2; 12; -5 from both sides

5 - 2 > -3 -2 ⇒ 3 > - 5
5 - 12 > -3 - 12 ⇒ -7 > -15
5 -(-5) > -3 - (-5) ⇒ 10 > 2

3..........................

- 9 < -6

Multiply both sides by 3; −3; −1

<em>When multiplying both sides of inequality by positive number the sign stays as is, when multiplying both sides of inequality by negative number the sign reverses</em>

-9 *3 < -6*3 ⇒ -27 < - 18
-9*(-3) > -6*(-3) ⇒ 27 > 18
-9*(-1) > -6*(-1) ⇒ 9 > 6

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3 years ago

Read 2 more answers

Which of the following probabilities is equal to approximately 0. 2957? Use the portion of the standard normal table below to he

Travka [436]

Probability of an event is the measure of its chance of occurrence. The event out of the listed events whose probability is 0.2957 is given by : Option C: $P(0.25 \leq Z \leq 1.25)$

<h3>How to get the z scores?</h3>

If we've got a normal distribution, then we can convert it to standard normal distribution and its values will give us the z-score.

If we have

$X \sim N(\mu, \sigma)$

(X is following normal distribution with mean $\mu$ and standard deviation $\sigma$ )

then it can be converted to standard normal distribution as

$Z = \dfrac{X - \mu}{\sigma}, \\\\Z \sim N(0,1)$

(Know the fact that in continuous distribution, probability of a single point is 0, so we can write

$P(Z \leq z) = P(Z < z) )$

Also, know that if we look for Z = z in z tables, the p-value we get is

$P(Z \leq z) = \rm p \: value$

Using the z-table, we get the needed probabilities as:

Case 1:

$P(-1.25 \leq Z \leq 0.25) = P(Z \leq 0.25) - P(Z \leq -1.25) \approx 0.5987 - 0.1056 = 0.4931$

Case 2:

$P(-1.25 \leq Z \leq 0.75) = P(Z \leq 0.75) - P(Z \leq -1.25) \approx 0.7734- 0.1056=0.6678$

Case 3:

$P(0.25 \leq Z \leq 1.25) = P(Z \leq 1.25) - P(Z \leq 0.25) \approx 0.8944 - 0.5987=0.2957$

Case 4:

$P(0.75 \leq Z \leq 1.25) = P(Z \leq 1.25) - P(Z \leq 0.75) \approx 0.8944 - 0.7734 =0.1210$

Thus, the event out of the listed events whose probability is 0.2957 is given by : Option C: $P(0.25 \leq Z \leq 1.25)$

Learn more about z-scores here:

brainly.com/question/13299273

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2 years ago