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Bezzdna [24]
3 years ago
8

What does -12 - (-7) equal?

Mathematics
2 answers:
Arlecino [84]3 years ago
8 0
The answer to this is -5 because 2 negatives = a positive
dolphi86 [110]3 years ago
7 0
-5 is the answer.

when subtracting a negative number, it is essentially the same as adding. so n-(-3) is the same as n+3 as two negative make a positive. if that makes sense. :) hope I helped
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3 years ago
Researchers examined the bill color (in hue degree) of male and female zebra finches. Here are the summary statistics from the s
sesenic [268]

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The answer to this question can be defined as follows:

Step-by-step explanation:

In the question some iformation is missing, which can be defined as follows:

Given:

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n_1= 59\\s_1= 1.46\\\bar y_1=2.91\\

The value of Females:

n_2=60\\s_2= 2.48\\\bar y_2=7.42\\

Calculating Degrees of Freedom:

\bold{ df=\frac{\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}}{ \frac{1}{n_1-1} (\frac{s_1^2}{n_1})^2+\frac{1}{n_2-1} (\frac{s_2^2}{n_2})^2}}\\\\\\

    =\frac{(\frac{1.46^2}{59}+\frac{2,48^2}{60})^2}{ \frac{1}{59-1} (\frac{1.46^2}{59})^2+\frac{1}{60-1} (\frac{2.48^2}{60})^2}\\

    =9.58 or 95

\alpha= 1-0.95\\\\

   = 0.05

for 95% confidence interval are:

\frac{\alpha}{2} = \frac{0.05}{2} = 0.025  

From its t-distribution table , the value of t has an region of (\frac{\alpha}{2} \ \ 0.025) for (df=95) in its upper tail.

shall be given by = t {0.025}=1.985

Calculating the margin of Error:

M_OE =t_{0.025} \times \sqrt{\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}}

         =1.985\times \sqrt{\frac{1.46^2}{59}+\frac{2.48^2}{60}}\\\\=0.739

The difference in mean bill color "\mu_2 -\mu_1" with 95% confidence intervals:

\to (7.42 - 2.91) \pm 0.739\\\\\to 4.51 \pm 0.739

Lower limit=3.771

Upper limit = 5.249

6 0
3 years ago
Please help and show ur work Thxs
lesya692 [45]
The slope is the number that is going to be next to x in the problem. The y intercept is going to b the independent number added or subtracted from the equation. This makes the correct answer y=9x+5.
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4 years ago
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