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GrogVix [38]
3 years ago
15

Which sets of numbers are closed under addition?

Mathematics
1 answer:
8_murik_8 [283]3 years ago
4 0
I would have to go with B as your answer 
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Is (9, 90) a solution to the equation y = 10x?<br>yes​
Galina-37 [17]

Use the substitution method

(9,90) y= 10x

90= 10(9)

90= 90

Answer is yes

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Round 8 5/6 to the nearest whole number
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Answer:

9

Step-by-step explanation:

8 5/6

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2 years ago
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8 0
3 years ago
A, B, and C are midpoints of ∆XYZ. What is the length of cy
iogann1982 [59]

Answer:

XY=36\ units

Step-by-step explanation:

<u><em>The correct question is</em></u>

A, B, and C are midpoints of ∆XYZ. What is the length of XY

we know that

The<u><em> Midpoint Theorem</em></u> states that the segment joining two sides of a triangle at the midpoints of those sides is parallel to the third side and is half the length of the third side

step 1

Find the length of YZ

AB=\frac{1}{2}YZ

we have

AB=24\ units

substitute

24=\frac{1}{2}YZ

solve for YZ

YZ=48\ units

step 2

Find the length of XY

Applying Pythagoras Theorem in the right triangle XYZ

XZ^2=XY^2+YZ^2

substitute the given values

60^2=XY^2+48^2

solve for XY

3,600=XY^2+2,304

XY^2=3,600-2,304

XY^2=1,296

XY=36\ units

Applying the Midpoint Theorem

BC=\frac{1}{2}XY -----> BC=\frac{1}{2}(36)=18\ units

AC=\frac{1}{2}XZ -----> AC=\frac{1}{2}(60)=30\ units

5 0
2 years ago
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