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2 years ago

What is 2 plus 2 minus 17

Mathematics

2 answers:

nataly862011 [7]2 years ago

8 0

<em>The result is -13</em>

<h2>Explanation:</h2><h2 />

Here we have the following addition problem:

$2+2-17$

So let's solve this step by step:

Step 1. Perform two plus two.

$2+2=4$

So:

$2+2-17=4-17$

Step 2. Perform the subtraction.

Since the sign (-) accompanies 17 which is greater than 4, then we perform the subtraction and add the sign (-) to the result. So:

$2+2-17=4-17=-13$

<em>Finally, the result is -13</em>

<h2>Learn more:</h2>

Distributive property: brainly.com/question/10794694

#LearnWithBrainly

Scilla [17]2 years ago

6 0

Answer: -13

Step-by-step explanation: that does not work

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Statistics professors believe the average number of headaches per semester for all students is more than 18. From a random sampl

kompoz [17]

Complete Question

Statistics professors believe the average number of headaches per semester for all students is more than 18. From a random sample of 15 students, the professors find the mean number of headaches is 19 and the standard deviation is 1.7. Assume the population distribution of number of headaches is normal.the correct conclusion at $\alpha =0.001$ is?

Answer:

There is no sufficient evidence to support the professor believe

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 18$

The sample size is $n = 15$

The sample mean is $\= x = 19$

The standard deviation is $\sigma = 1.7$

The level of significance is $\alpha = 0.001$

The null hypothesis is $H_o: \mu = 18$

The alternative hypothesis is $H_a : \mu > 18$

The critical value of the level of significance from the normal distribution table is

$Z_{\alpha } = 3.290527$

The test hypothesis is mathematically represented as

$t = \frac{\= x - \mu }{ \frac{\sigma}{ \sqrt{n} } }$

substituting values

$t = \frac{ 19 - 18}{ \frac{1.7}{ \sqrt{15} } }$

$t = 2.28$

Looking at the value of t and $Z_{\alpha }$ we can see that $t < Z_{\alpha }$ so we fail to reject the null hypothesis.

This mean that there is no sufficient evidence to support the professor believe

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2 years ago

The total price for a computer and a

8_murik_8 [283]

Answer:

$289

Step-by-step explanation:

If you know the cost of one of the two items, you can subtract that item from the total in order to find the price of the second item

So: total price - computer price = printer cost

So: $1039- $750 = $289

The printer is $289

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1 year ago

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Answer:

x=-20

Step-by-step explanation:

x+9=-11

Subtract 9 from both sides. (-11-9=-20)

x=-20

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Step-by-step explanation:

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