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Burka [1]
3 years ago
8

Explain why the triangles are similar. Then find the value of x.

Mathematics
1 answer:
djyliett [7]3 years ago
8 0
Answer: Choice A) AA postulate; 18

---------------------------------------------------------------------------------------

Work Shown:

The triangles are similar to each other due to the AA (angle angle) postulate. The top angles are overlapping or shared angles. So that's the first pair. The second pair of angles is either bottom pair of angles, from the fact that corresponding angles are congruent. This is only true if the lines are parallel.

Due to the similar triangles, we can set up the proportion and solve for x
8/(8+4) = 12/x
8/12 = 12/x
8*x = 12*12 ... cross multiply
8x = 144
x = 144/8
x = 18

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Find all solutions for a triangle with a = 14, b= 12, and B = 90°.
ziro4ka [17]

Answer:

No solution.

Step-by-step explanation:

Given

a = 14; b= 12; B = 90^\circ

Required

Find all possible solutions

If B = 90^\circ, then the triangle is right-angled and the hypotenuse is at b

Given that a = 14; b= 12;

This implies that a > b

In a right-angled triangle, the hypotenuse (side b) is the longest.

Since this is not true for the given sides, then the triangle has no solution.

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3 years ago
Jessica's home town is a mid-sized city experiencing a decline in population. The following graph models the estimated populatio
Vaselesa [24]
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MrMuchimi
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3 years ago
Find the Taylor series for f(x) centered at the given value of a. [Assume that f has a power series expansion. Do not show that
FromTheMoon [43]

Answer:

The Taylor series is \ln(x) = \ln 3 + \sum_{n=1}^{\infty} (-1)^{n+1} \frac{(x-3)^n}{3^n n}.

The radius of convergence is R=3.

Step-by-step explanation:

<em>The Taylor expansion.</em>

Recall that as we want the Taylor series centered at a=3 its expression is given in powers of (x-3). With this in mind we need to do some transformations with the goal to obtain the asked Taylor series from the Taylor expansion of \ln(1+x).

Then,

\ln(x) = \ln(x-3+3) = \ln(3(\frac{x-3}{3} + 1 )) = \ln 3 + \ln(1 + \frac{x-3}{3}).

Now, in order to make a more compact notation write \frac{x-3}{3}=y. Thus, the above expression becomes

\ln(x) = \ln 3 + \ln(1+y).

Notice that, if x is very close from 3, then y is very close from 0. Then, we can use the Taylor expansion of the logarithm. Hence,  

\ln(x) = \ln 3 + \ln(1+y) = \ln 3 + \sum_{n=1}^{\infty} (-1)^{n+1} \frac{y^n}{n}.

Now, substitute \frac{x-3}{3}=y in the previous equality. Thus,

\ln(x) = \ln 3 + \sum_{n=1}^{\infty} (-1)^{n+1} \frac{(x-3)^n}{3^n n}.

<em>Radius of convergence.</em>

We find the radius of convergence with the Cauchy-Hadamard formula:

R^{-1} = \lim_{n\rightarrow\infty} \sqrt[n]{|a_n|},

Where a_n stands for the coefficients of the Taylor series and R for the radius of convergence.

In this case the coefficients of the Taylor series are

a_n = \frac{(-1)^{n+1}}{ n3^n}

and in consequence |a_n| = \frac{1}{3^nn}. Then,

\sqrt[n]{|a_n|} = \sqrt[n]{\frac{1}{3^nn}}

Applying the properties of roots

\sqrt[n]{|a_n|} = \frac{1}{3\sqrt[n]{n}}.

Hence,

R^{-1} = \lim_{n\rightarrow\infty} \frac{1}{3\sqrt[n]{n}} =\frac{1}{3}

Recall that

\lim_{n\rightarrow\infty} \sqrt[n]{n}=1.

So, as R^{-1}=\frac{1}{3} we get that R=3.

8 0
4 years ago
I need the answers for this slide! :( Seriously it's like nothing we learned in class. I don't understand this
gtnhenbr [62]

Hopefully I can explain this well enough..

If you've ever heard of slope, it is the same as constant of proportionality. If you haven't, it's pretty simple to find on a graph. Look where the line perfectly hits the graph numbers by at least two times. So, on the graph, you can see that it goes through (1, 4) and (2, 8). You can find the slope two ways from this point, but I'm not really sure how to explain it just from typing, so I'll explain one the way it's written.

The formula for finding slope is y2-y1/x2-x1. Plugging in the numbers in the equation, it should look like 8-4/2-1, which simplifies to 4. This is the complicated way, so I'm sorry, but if you want to do the graph way, the way it's written is rise/run.

Equations are y=mx+b. m stands for slope and b is the y-intercept. We covered the slope (4), so we just need the intercept. The intercept is just asking where the line goes through y. We can see that it started at 0, so the equation is simply y=4x.

Now onto the second question. I'm a little confused if the number of baskets is x, or if the cost is x... I'm just going to go on and guess that the Number of Baskets is x.

Finding the constant of proportionality is so much easier on this because you can do 12/3 which gets you 4. All of the others have this too, so you know it's 4. In the end, the equation is, once again, y=4x.  

So, in the end, these should and hopefully be the correct answers:

3.

Constant of Proportionality: 4

Equation: y=4x

4.

Constant of Proportionality: 4

Equation: y=4x

7 0
3 years ago
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