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AnnZ [28]
3 years ago
5

An eraser is in the shape of a triangular prism. Its dimensions are shown in the diagram. What is surface area of the

Mathematics
2 answers:
MArishka [77]3 years ago
7 0

Answer:

D) 6,000 square mm

Step-by-step explanation:

To find the surface area of the triangular prism, find the are of each face.

  • 40 × 30 ÷ 2 = 600 × 2 sides = 1200
  • 40 × 50 = 2000
  • 40 × 30 = 1200
  • 40 × 40 = 1600

After adding all the sides' together, you get 6,000 square mm.

Colt1911 [192]3 years ago
4 0

Answer:

6000 square millimeters

Step-by-step explanation:

Side length of the slanting side can be calculated using the Pythagorean theorem,

L = sqrt(30^2+40^2) = 50

sufrace area of a triangular prism

= surface area of the end sections + the surface area of the three side faces

= 2*(30*40/2) + 40*(30+40+50)

= 1200 + 4800

= 6000 mm^2

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The original quantity is 20 and the new quantity is 15. Adam incorrectly says the percent decrease is about ​14.29%. What is the
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Answer: A. divided the difference of the two quantities by the sum of the two quantities.

===================================================

Explanation:

The difference of the quantities is 20-15 = 5

The sum of the quantities is 20+15 = 35

Dividing those results leads to 5/35 = 0.142857 which rounds to 0.1429

That converts to 14.29%

This is likely the path Adam took. This path is incorrect. The correct steps are shown below

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Difference = 20-15 = 5

Divide the difference over the original quantity

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We have a 25% decrease because the new quantity (15) is smaller than the old quantity (20)

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Here's another way to approach the problem

A = old value = 20

B = new value = 15

C = percent change

C = [ (B-A)/A ] * 100%

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The negative C value means we have a negative percent change, ie we have a percent decrease. So this is another way to get a 25% decrease.

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3 years ago
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Martin deposits $700 into a savings account that gains interest at a rate of 5.5% annually. If he waits 7 years to withdraw the
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。☆✼★ ━━━━━━━━━━━━━━  ☾  

Use the multiplier 1.055

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