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3 years ago

If you are subtracting (2n - 4)-(4n-3) what do you get

1 answer:

6 0

You first have to distribute the negative to the second pair of parenthesis. So the new equation would be 2n-4-4n+3. Next you combine like terms. So your final answer is -2n-1.

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Correct answer for 12

andrezito [222]

C
Explanation
There are 4 books and you want to randomly take 2 ( A and B) so it would be 2/4 and if you simplify it would be 1/2

4 0

4 years ago

Read 2 more answers

Which shows how to find 7 x 210 mentally by using the Distributive Property? (Image)

alex41 [277]

Answer:

G. 7(200)+7(10)

Step-by-step explanation:

First, you would multiply 200 by 7

Once you do that you should get 1400

After that you mulitply 7 by 10

You should get 70

Add 1400 by 70 and there you go your answer 1,470

6 0

3 years ago

Read 2 more answers

Marshall can make 6 necklaces every hour. Yolanda can make 3 times that many every hour. How many hours would it take them to ma

SCORPION-xisa [38]

Marshall- 8 hours because 8•6=48
Yolanda- 3 hours because 6•3=18
18•2= 36 18•3=54

3 0

3 years ago

What is the solution for 6.50*21+f=201.50

Natasha2012 [34]

Answer:

f = 65

Step-by-step explanation:

6.50*21+f=201.50

We need to isolate f

1. multiply 6.50 by 21. 6.50 * 21 = 136.5

136.5+f= 201.50

2. Since 136.5 is positive and not being subtracted we will...

Subtract 136.5 from both sides

136.5-136.5=0+f

201.50-136.50 = 65

thus leaving f = 65

3 0

3 years ago

Read 2 more answers

Do political science classes require less writing than history classes? The 55 randomly selected political science classes assig

saul85 [17]

Answer:

We conclude that political science classes require less writing time than history classes at 0.01 level of significance.

Step-by-step explanation:

We are given that the 55 randomly selected political science classes assigned an average of 16.3 pages of essay writing for the course. The standard deviation for these 55 classes was 4.8 pages.

The 54 randomly selected history classes assigned an average of 18.9 pages of essay writing for the course. The standard deviation for these 54 classes was 5 pages.

Let $\mu_1$ = average writing time required by political science classes.

$\mu_2$ = average writing time required by history classes.

So, Null Hypothesis, $H_0$ : $\mu_1\geq\mu_2$ {means that political science classes require more or equal writing time than history classes}

Alternate Hypothesis, $H_A$ : $\mu_1$ {means that political science classes require less writing time than history classes}

The test statistics that would be used here Two-sample t test statistics as we don't know about the population standard deviation;

T.S. = $\frac{(\bar X_1-\bar X_2)-(\mu_1-\mu_2)}{s_p \sqrt{\frac{1}{n_1}+\frac{1}{n_2} } }$ ~ $t__n_1_-_n_2_-_2$

where, $\bar X_1$ = sample average pages of essay writing for political science classes = 16.3 pages

$\bar X_2$ = sample average pages of essay writing for history classes = 18.9 pages

$s_1$ = sample standard deviation for political science classes = 4.8 pages

$s_2$ = sample standard deviation for history classes = 5 pages

$n_1$ = sample of political science classes = 55

$n_2$ = sample of history classes = 54

Also, $s_p=\sqrt{\frac{(n_1-1)s_1^{2}+(n_2-1)s_2^{2} }{n_1+n_2-2} }$ = $\sqrt{\frac{(55-1)\times 4.8^{2}+(54-1)\times 5^{2} }{55+54-2} }$ = 4.90

So, test statistics = $\frac{(16.3-18.9)-(0)}{4.9 \sqrt{\frac{1}{55}+\frac{1}{54} } }$ ~ $t_1_0_7$

= -2.77

The value of t test statistics is -2.77.

Now, at 0.01 significance level the t table gives critical value of -2.365 at 107 degree of freedom for left-tailed test.

Since our test statistics is less than the critical value of t, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which we reject our null hypothesis.

Therefore, we conclude that political science classes require less writing time than history classes.

3 0

3 years ago