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Vadim26 [7]
3 years ago
11

NEED ANSWER NOW.. PLZ HELP NEED CORRECT ANSWERS!!!!WILL MARK BRAINLIEST!!

Mathematics
1 answer:
ikadub [295]3 years ago
3 0

Answer:

1. Equal

2. Not equal.

Step-by-step explanation:

1.     -2 * -0.16 = -0.32

      0.16 * (-2) =  -0.32    EQUAL


2.    0.4 / (-3) = - 0.1333...

       -3 / 0.4 =   -7.5  Not equal

       



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Answer:

A. less than three batteries were used in five hours.

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Fynjy0 [20]

Answer: (23.3,\ 29.7)

Step-by-step explanation:

The confidence interval for population mean is given by :-

\overline{x}\pm ME., where \overline{x} is the sample mean and ME is the margin of error .

Given : The sample mean : \overline{x}=26.5

Margin of error : ME=3.2

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26.5\pm 3.2=(26.5-3.2,\ 26.5+3.2)=(23.3,\ 29.7)

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Help? im confused plss!<br> Find the area of the regular polygon with the given radius or apothem
Snezhnost [94]

Answer:

  50 cm²

Step-by-step explanation:

Given that the regular polygon is a square, there are multiple ways you can jump directly to the answer. Perhaps the simplest is to use the formula for the area of a rhombus:

  A = 1/2(d1)(d2)

where d1 and d2 are the lengths of the diagonals. Here, we see that half the diagonal is 5 cm, so the area is ...

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__

<em>Alternate solution</em>

If you want to use the radius and the number of sides in a formula, you can consider the area of each triangle formed by radii and a side. That triangle has area ...

  A = 1/2r²sin(α)

where r is the radius and α is the central angle. For an n-sided polygon, the area is the sum of n of these triangles, and the central angle is 360°/n. Then the polygon area is ...

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For n = 4 and r = 5 cm, the area is ...

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<em>Additional comment</em>

The formula is somewhat different if you start with the length of the apothem. One way to find the area is using the above formula and the relation between the radius and apothem:

  r = a·sec(180°/n)

Another formula uses the apothem directly:

  A = n·a²·tan(180°/n)

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Answer:

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Step-by-step explanation:

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