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expeople1 [14]
2 years ago
10

Please answer all the questions

Mathematics
1 answer:
NARA [144]2 years ago
5 0

I am not answering all the questions.

I will only do the first one.

A = pir^2

A = pi(6)^2

A = 36pi

You do the rest.

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Help please asap :))
erma4kov [3.2K]
Go on kahoot if your still doing it go to practice and see what the answers are and either memorize them or write them down or do the math problem
7 0
3 years ago
Read 2 more answers
Help me please :) its very hard
postnew [5]

Answer:

Answer B

Step-by-step explanation:

You need to first find the surface area of the triangular prism.

In order to do that, we need to first know the length of the base of the triangles on both side. So, I used the pythagorean theorem (a²+b²=c²) after making the triangle a right triangle by cutting it in HALF.

a²+b²=c²

a²+2.6²=3²

a²+6.76=9

Subtract 6.76 on both sides

a²=2.24

a=√2.24

a=1.49666295471

Now, we know that the base of HALF of the triangles on both sides of the prism is 1.496......

We need to MULTIPLY this by 2 to get the full length. So, the length of the bases of both triangles is 2.99332590942

The height of the triangles is 2.6

We are going to first find the area of one triangle and multiply it by 2, to get the area of both triangles.

Area of a triangle = base x height ÷ 2

2.6 x 2.99332590942= 7.78264736449

7.78264736449 ÷ 2 = 3.89132368224

3.89132368224 x 2 (because we have 2 triangles) =7.78264736449  cm squared

Now, we know the area of both triangles, but we now need to add the add the surface area of the rectangles in the net.

Area of a rectangle = length x width

We know that all of the three rectangles are equal in size, and that the length of each one of them is 15 cm. However, the width/height of each one is unknown. We will find out the height of each one by looking at the length of the base of the triangle attached to the first one. We know that because of the base of the triangles = 2.99332590942, the width of the attached rectangles are 2.99332590942. We found this using the Pythagorean theroem (look above).

15 x 2.99332590942= 44.8998886413

44.8998886413 x 3 (because we have 3 of the same rectangles)= 134.699665924 cm squared

Now, we must ADD the surface area of the rectangles AND the triangles.

7.78264736449 (triangles) + 134.699665924 (the three rectangles)= 142.482313288 cm squared.

The CLOSEST OPTION to the answer we got is ANSWER B because it is 142.8 cm squared, which is the closest to the answer we got which was 142.482313288 cm squared.

I really hope this helps :)

6 0
2 years ago
Read 2 more answers
The area of a rectangle is 77 ft2 , and the length of the rectangle is 10 ft less than three times the width. find the dimension
ElenaW [278]

width (w) = w

Length (L) = 3w - 10

Area (A) = L x w

77 = (3w - 10)w

77 = 3w² - 10w

0 = 3w² - 10w - 77

0 = 3w² - 21w + 11w - 77

0 = 3w(w - 7) + 11(w - 7)

0 = (3w + 11)(w - 7)

0 = 3w + 11, 0 = w - 7

w = \frac{-11}{3}, w = 7 (width cannot be negative!)

w = 7

Length (L) = 3w - 10 = 3(7) - 10 = 21 - 10 = 11

Answer: width = 7 ft, Length = 11 ft

8 0
3 years ago
Help me please righjt now i need help
vichka [17]

Answer: 16

Step-by-step explanation:

If you are trying to find the area, you should multiply

6 x 2 = 12 and 3 x 1 = 3. Then, you add 12 + 3 = 16 and that should be your answer...hope it is right.

6 0
2 years ago
Read 2 more answers
How do you write 25-0.6 X in an algebraic expression
iragen [17]
This is how 25-0.6x
Hope this helps
3 0
3 years ago
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