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Marat540 [252]
2 years ago
14

Plsss help me need help

Mathematics
1 answer:
Vera_Pavlovna [14]2 years ago
8 0

Answer:

Step-by-step explanation:

a. 9(4x - 3y - \frac{2}{3})

   36x - 27y - (\frac{9}{1} * \frac{2}{3})

  36x - 27y - \frac{18}{3}

  36x - 27y - 6

b. -2 (-6x + 3y - 1)

   12x - 6y + 2

c. \frac{1}{5}(20y - 4x - 13)

   4y - \frac{4}{5}x - \frac{13}{5}

 - \frac{4}{5}x + 4y - \frac{13}{5}

d. 8(-x - \frac{1}{2})

  -8x - 4

e. -8(-x - \frac{3}{4}y + \frac{7}{2})

   8x + \frac{24}{4}y - \frac{56}{2}

   8x + 6y - 28

Hope that helps!

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3 years ago
A number is subtracted from 20 and from 17. The product of the number so obtained is 180. Find the original number
matrenka [14]

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2 years ago
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5 0
3 years ago
Area of a circle is 80 cm². Work out the circumference of the circle.
GuDViN [60]

Answer:

The circumference of circle is: 31.714 cm

Step-by-step explanation:

Let C be the circumference of the circle

And A be the area of circle

It is given that:

A = 80cm^2

We have to find the radius first so that it can be used to find the circumference

The area of circle is given by the formula:

A = \pi r^2

Putting the value of area

80 = 3.14 * r^2\\\frac{80}{3.14} = r^2\\r^2 = 25.477

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The circumference of circle is: 31.714 cm

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