3 years ago

Which set is closed under subtraction?

Mathematics

1 answer:

Semmy [17]3 years ago

4 0

Answer:

Set of rational numbers

Step-by-step explanation:

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What other information do you need in order to prove the triangles congruent using the SAS Congruence Postulate?

Mazyrski [523]

Answer:

<CBA = <CDA

Step-by-step explanation:

Using <CBA = <CDA and Base angle theorem, you can say that AB = AD.

Now you have <CBA = <CDA, AB = AD, and CB = CD. These prove SAS.

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3 years ago

Read 2 more answers

Convert the angle \theta=\dfrac{8\pi}{9}θ=

Olegator [25]

Answer:

160°

Step-by-step explanation:

-Given the angle in radians as $\theta=\dfrac{8\pi}{9}\ rad$

-We know that $1 \ rad=\frac{180}{\pi}\textdegree$

-Let our angle theta be X

#We therefore equate and cross multiply:

$1\ rad=\frac{180}{\pi}\\\\\frac{8\pi}{9}=x\\\\\therefore X=\frac{180}{\pi}\times \frac{8\pi}{9}\\\\=160\textdegree$

Hence, angle θ is 160°

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3 years ago

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salantis [7]

Sarah will need 27pts her lowest score

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3 years ago

Given: A= {(2,3), (5,1).(-3,-2), (0, 3))<br> What is the domain of A?

xxMikexx [17]

Answer:

The domain is (2,5,-3,0)

Step-by-step explanation:

we know that

For a set of ordered pairs, the first elements of each ordered pair represents the domain of the function and second elements of each ordered pair represents the range of the function.

The domain of a function is the set of all possible values of x

In this problem we have

$A= \ [(2,3), (5,1).(-3,-2), (0, 3)\ ]$

therefore

The domain is (2,5,-3,0)

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3 years ago

In △ABC point D is the midpoint of AB , point E is the midpoint of BC , and point F is the midpoint of BE . Find area of △ABC, i

xz_007 [3.2K]

I did this manually on some notepaper but my scanner is not working.

The answer is 72 cm^2

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3 years ago