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Elden [556K]
3 years ago
12

A science teacher needs to choose 4 students from a class of 20 to go to the library to do some research. How many different gro

ups can he select?
Mathematics
1 answer:
Marysya12 [62]3 years ago
8 0
20\4=5
Since there are 20 people and we want grps of 4
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Decimal 1.25
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-17, 2, 21, 40, … is an arithmetic sequence.<br><br> True<br><br> False
Wewaii [24]

False

A arithmetic sequence is a sequence that has a difference of 2. We see that we have -17 ... and then we have 2 ... and then 21. There is NOT a difference of 2, as we can see. Therefore, yiur answer would be (false).


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In the diagram below, DE is parallel to XY. What is the value of y?​
nasty-shy [4]

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94

Step-by-step explanation:

Y is the alternate interior angles of the degree that measures 94. This means that they are congruent so y=94

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Find u and v only please:
tekilochka [14]

Every two triangles are similar. Therefore the sides of triangles are in proportion.

We have the equations:

1.

\dfrac{3}{5}=\dfrac{3+x}{20}    <em>cross multiply</em>

5(3+x)=(3)(20)      <em>divide both sides by 5</em>

3+x=(3)(4)

3+x=12      <em>subtract 3 from both sides</em>

\boxed{x=9}

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

2.

\dfrac{3}{4}=\dfrac{9}{y}      <em>cross multiply</em>

3y=(4)(9)

3y=36      <em>divide both sides by 3</em>

\boxed{y=12}

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

3.

\dfrac{3}{5}=\dfrac{3+9+u}{60}

\dfrac{3}{5}=\dfrac{12+u}{60}    <em>cross multiply</em>

5(12+u)=(3)(60)      <em>divide both sides by 5</em>

12+u=(3)(12)

12+u=36      <em>subtract 12 from both sides</em>

\boxed{u=24}

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

4.

\dfrac{3}{4}=\dfrac{24}{v}              <em>cross multiply</em>

3v=(4)(24)

3v=96      <em>divide both sides by 3</em>

\boxed{v=32}

3 0
3 years ago
Please help me, i’m struggling so bad, il mark you brainliest if you give me the answer
Jet001 [13]

Answer:

210 squared inches, I think

Step-by-step explanation:

21 x 15 = 315 (area of original map)

315 x 2/3 = 210

7 0
3 years ago
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