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4 years ago

IM CONFUSED WILL GIVE BRAINLIST

Mathematics

2 answers:

julia-pushkina [17]4 years ago

5 0

Answer:

Step-by-step explanation:

The two triangles are identical.

Mice21 [21]4 years ago

4 0

Answer:

CD=13

Step-by-step explanation:

Basically, this is asking for the value of line CD. When we look at the diagram, we can see two angles at the top of the triangle. They are separated by a completely vertical line. So we know for a fact, that these two triangles are congruent-- they are the same. So line AD, which is 13 units long, must be the same as line CD. Therefore, we can conclude that CD is 13 units long.

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The value of -8/15 · 20/65 is _____. -1/6 1/6 2/3 - 2/3

vova2212 [387]

Step-by-step explanation:

2/3 is right and ok then thank

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3 years ago

I need help making a proof for geometry! Here is the question I really need help on this question my marking period ends soon!

Anni [7]

Answer:

Step-by-step explanation:

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3 years ago

Many high school students take the AP tests in different subject areas. In 2007, of the 144,796 students who took the biology ex

Nataly [62]

Answer:

$(0.582-0.485) - 1.64 \sqrt{\frac{0.582(1-0.582)}{144796} +\frac{0.485(1-0.485)}{211693}}=0.0942$

$(0.582-0.485) + 1.64 \sqrt{\frac{0.582(1-0.582)}{144796} +\frac{0.485(1-0.485)}{211693}}=0.09978$

And the 90% confidence interval would be given (0.0942;0.09978).

We are confident at 90% that the difference between the two proportions is between $0.0942 \leq p_A -p_B \leq 0.09978$

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$p_A$ represent the real population proportion female for Biology

$\hat p_A =\frac{84199}{144796}=0.582$ represent the estimated proportion female for biology

$n_A=144796$ is the sample size for A

$p_B$ represent the real population proportion female for calculus AB

$\hat p_B =\frac{102598}{211693}=0.485$ represent the estimated proportion female for Calculus AB

$n_B=211693$ is the sample size required for B

$z$ represent the critical value for the margin of error

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

The confidence interval for the difference of two proportions would be given by this formula

$(\hat p_A -\hat p_B) \pm z_{\alpha/2} \sqrt{\frac{\hat p_A(1-\hat p_A)}{n_A} +\frac{\hat p_B (1-\hat p_B)}{n_B}}$

For the 90% confidence interval the value of $\alpha=1-0.90=0.1$ and $\alpha/2=0.05$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=1.64$

And replacing into the confidence interval formula we got:

$(0.582-0.485) - 1.64 \sqrt{\frac{0.582(1-0.582)}{144796} +\frac{0.485(1-0.485)}{211693}}=0.0942$

$(0.582-0.485) + 1.64 \sqrt{\frac{0.582(1-0.582)}{144796} +\frac{0.485(1-0.485)}{211693}}=0.09978$

And the 90% confidence interval would be given (0.0942;0.09978).

We are confident at 90% that the difference between the two proportions is between $0.0942 \leq p_A -p_B \leq 0.09978$

5 0

4 years ago

How would you write an expression using a variable for the area and perimeter of a square with side 2x-9

Paladinen [302]

Perimeter :
because there are four sides to a square and all sides are the same, the answer is 4(2x-9)
area:
area is basically length times width so the answer is (2x-9)(2x-9) or (2x-9)^2

7 0

4 years ago

How many oz in 3/4 lbs

zubka84 [21]

Answer:

12 ounces-- hope this helps :))

Step-by-step explanation:

3 0

3 years ago

IM CONFUSED WILL GIVE BRAINLIST ​

IM CONFUSED WILL GIVE BRAINLIST