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3 years ago

Round your answer to the nearest tenth of a cubic centimeter.

Mathematics

1 answer:

Zigmanuir [339]3 years ago

8 0

Answer:

22.1

Step-by-step explanation:

Because of it being a pyramid we must use the equation Bh1/2

B = L + W we assume that the base is a perfect square meaning all sides are the same length B = 4.8 + 4.8 = 9.6 then we multiply by the height

9.6 x 4.6 = 44.16 next you divide by 2 or multiply by .5

44.16/2 = 22.08 then finally rounding to the nearest tenth

making 22.1 cubic inches

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The sum of two numbers is 27 and their product is 50. Find the numbers.?

san4es73 [151]

Answer:

a + b = 27

=> a = 27 - b

ab = 50

So, (27 - b) x b = 50

27b - b^2 = 50

b^2 - 27b + 50 = 0

Solving, b = 25, 2

Hence,

Case 1: b = 25, a = 2

Case 2, b = 2, a = 25

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3 years ago

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When a number is decreased by 40% of itself, the result is 36. What is the number?

nataly862011 [7]

Answer:

Step-by-step explanation:

If 36 is the result of reducing the number by 40% then 36 is 60% of the number you can then division by 0.6 to get 60. 60. 100–40=60

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3 years ago

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Noise levels at 3 airports were measured in decibels yielding the following data:

Shalnov [3]

Answer:

a) The 90% confidence interval for the mean noise level at such locations

(112.46 , 163.54)

b) The critical value that should be used in constructing the confidence interval

Z₀.₁₀ = 1.645

Step-by-step explanation:

Step(i) :-

Noise levels at 3 airports were measured in decibels yielding the following data

108 146 160

Mean of given data

$x^{-} = \frac{108+146+160}{3} = 138$

x : 108 146 160

x-x⁻ : -30 8 22

(x-x⁻ )² : 900 64 484

Variance σ ² = ∑(x-x⁻ )²/ n-1

= $\frac{900+64+484}{3-1}= 724$

Standard deviation

σ = √724 = 26.90

Step(ii):-

The 90% confidence interval for the mean noise level at such locations

$(x^{-} - Z_{0.90} \frac{S.D}{\sqrt{n} } , (x^{-} + Z_{0.90} \frac{S.D}{\sqrt{n} } )$

The critical value that should be used in constructing the confidence interval

Z₀.₁₀ = 1.645

$(138 - 1.645 \frac{26.90}{\sqrt{3} } , (138 + 1.645 \frac{26.90}{\sqrt{3} } )$

( 138 - 25.54 , 138 + 25.54 )

(112.46 , 163.54)

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3 years ago

IXL graph a line using slope

Mrac [35]

Answer:

Graph your first point on (0,-5) then go up 9, and to the right 7. Repeat once or twice or until necessary to draw the line :)

Step-by-step explanation:

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4 years ago

Help me please i really need it I need solution.

Strike441 [17]

Answer:

30 are present and 10 are absent

Step-by-step explanation:

75% of 40 is 30

Therefore 30 pupils are present

And 10 pupils are absent

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