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I am Lyosha [343]
2 years ago
15

8) can u answer this question pls

Mathematics
1 answer:
Vsevolod [243]2 years ago
3 0

Answer: 346.19cm²

Step-by-step explanation:

π= 3.14

Divide 21 (the diameter) by 2 to get the radius( it 's half of the diameter). so the radius is 10.5

Area= πr²

       = 3.14x10.5x10.5

       = 346.185

So next round up the value you got to the nearest tenth, so when u round up to the nearest tenth you get 346.19

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The perimeter of a rectangle is 140 feet. The length of the rectangle is 6 more than 2 times the width. What is the length of th
Alja [10]
The equations we get are
l = 6 + 2w (We get this from "The length of the rectangle is 6 more than 2 times the width.")
and
2l + 2w = 140 (We get this from the perimeter. Two times the length plus two times the width equals the perimeter of a quadrilateral.)

The first equation can be written as
l - 2w = 6

So now we have
2l + 2w = 140
l - 2w = 6
____________
Add the two equations.
We get 3l = 146

Divide by 3 on both sides.
l = 48\frac{2}{3}

Your answer is 48\frac{2}{3}.
5 0
3 years ago
(brainliest)Armando found the volume of the figure below by using the steps shown. A rectangular prism with a length of 18 inche
Shkiper50 [21]

Answer:  Armando used the wrong dimensions for the triangular prism.

Step-by-step explanation:

Hi, to answer this question we have to analyze Armando’s work.

Total Volume = Volume of rectangular prism + volume of triangular prism  

Total Volume = 5 (8) (18) + one-half (6) (18) (8)  

Total Volume= 720 + 432  

Total volume = 1,152 cubic inches.

He made a mistake in the second step, where used h=8 for the triangular prism instead of h= 5 . (h=height)

The correct way to solve this is.

Total Volume = 5 (8) (18) + one-half (6) (18) (5)  

Total Volume= 720 + 270

Total volume = 990 cubic inches.

7 0
3 years ago
Read 2 more answers
Kenisha evaluated the power as shown.
sattari [20]

Answer:

C

Step-by-step explanation:

No, she didn’t use the entire fraction as the base, so wrote the expanded form wrongly.

and I know this cuz I took the test

8 0
2 years ago
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if grace and claire parents each invested 7,600 into college saving account when the girls were born how much money will each gi
Mrrafil [7]

Answer:

7,600

Step-by-step explanation:

both parents invest 7,600.

7,600x2= 15,200

there are 2 girls so divide 15,200 by 2 and u get 7,600

3 0
2 years ago
Please help !!!!!!!!!!!!!!!!
irina [24]

Answer:

Please refrain from posting duplicate questions.

Step-by-step explanation:

All Brainly users all need a fair chance at getting help on their questions too. Please refer to the brainly.com guidelines.

7 0
2 years ago
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