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postnew [5]
3 years ago
11

What is the result when the number 20 is decreased by 75%?

Mathematics
2 answers:
sergeinik [125]3 years ago
8 0

Answer:

5

Step-by-step explanation:

20 - (75% × 20) =

20 - 75% × 20 =

(1 - 75%) × 20 =

(100% - 75%) × 20 =

25% × 20 =

25 ÷ 100 × 20 =

25 × 20 ÷ 100 =

500 ÷ 100 =

5;

kolezko [41]3 years ago
7 0
You would get 5.5 as a result
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What is the solution of the system? y=x^2 + 6x + 9
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Because we have two values of x, we can set the two expressions equal to each-other.

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x^2 + 5x + 6 = 0

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Using the AC method, we can simplify this equation to (x + 2)(x + 3)

The solutions to the system of equations presented are:

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The 20 tallest buildings in the world have an average height of 1,667.25 feet, with a standard deviation of 318.31 feet. The Zif
valentina_108 [34]

Answer:

Marina, Wuhan center, Zifeng Tower , Shangai Tower

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For Marina, we use the same procedure;

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The reasoning behind this can be mathematically explained in terms of the z-score. The standard score of the heights of the building give us an insight as to how tall the buildings can be.

Since they are in the same population i.e building heights, the higher the z-score, the higher the height of the building. A positive z-score indicates a height taller than the average while a negative z-score indicate a height lower than the average height which is the mean

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Answer is provided in the image attached.

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