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Elena L [17]
3 years ago
6

Find -3/7 ÷ -1 1/4 please

Mathematics
1 answer:
lara [203]3 years ago
6 0

Answer:

12/77

Step-by-step explanation:

-3/7 ÷ -11/4

switch the numerator and denominator around because of division

-3/7×-4/11=12/77

as negatives cancel each other out

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In the following figure, triangle ABC and triangle DEF are similar. What is the value of x ? Triangle ABC and triangle DEF are s
Shtirlitz [24]
X = 25.5 mm.

Using the similarity statement given, that ΔABC ~ ΔDEF, we set up a proportion:

8.5/x = 4/12

Cross multiply:
4*x = 8.5*12
4x = 102

Divide both sides by 4:
4x/4 = 102/4
x = 25.5
7 0
3 years ago
At midnight the temperature was -8 degree F. At noon the Temperature was 23 degrees F. Which expression represents the increase
Firlakuza [10]

23- -8

This equals to 31. 31 degrees was the increase

6 0
3 years ago
Which expression should you simplify to find the 90% confidence interval,
Alex787 [66]

Answer:

0.45 - 1.96\sqrt{\frac{0.45(1-0.45)}{36}}=0.287

0.45 + 1.96\sqrt{\frac{0.45(1-0.45)}{36}}=0.613

And we can conclude at 95% of confidence that the true proportion of interest for this case is between 0.287 and 0.613

Step-by-step explanation:

The estimated proportion of interest is \hat p=0.45

We need to find a critical value for the confidence interval using the normla standard distributon. For this case we have 95% of confidence, then the significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value is:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

The confidence interval for the true population proportion is interest is given by this formula:  

\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}

Replacing the values provided we got:

0.45 - 1.96\sqrt{\frac{0.45(1-0.45)}{36}}=0.287

0.45 + 1.96\sqrt{\frac{0.45(1-0.45)}{36}}=0.613

And we can conclude at 95% of confidence that the true proportion of interest for this case is between 0.287 and 0.613

8 0
3 years ago
2+3+4+3+5+6+7<br> Anyone want points? Every week once.
Otrada [13]

Answer:

30

Step-by-step explanation:

Thank you! I hope you have a good day :)

7 0
2 years ago
Read 2 more answers
If you were to move use the substitution method to solve the following system choose the new equation after the expression equiv
yanalaym [24]

Solve x+4y = 13 for x by subtracting 4y from both sides.

We end up with x = -4y+13.

Since x and -4y+13 are the same, we can replace every x in the first equation with -4y+13

2x-3y = -29

2( x ) - 3y = -29

2( -4y+13 ) - 3y = -29 ... x is replaced with -4y+13

The answer is choice B

8 0
3 years ago
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