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sesenic [268]
3 years ago
12

Help me find my answer please

Mathematics
2 answers:
jonny [76]3 years ago
7 0

Answer:

-3

Step-by-step explanation:

\frac{-1}{3} =\frac{-3}{9}

Hunter-Best [27]3 years ago
3 0

Answer:

y = - 3

Step-by-step explanation:

Given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition that y = - 1 when x = 3, thus

- 1 = 3k ( divide both sides by 3 )

- \frac{1}{3} = k

y = - \frac{1}{3} x ← equation of variation

When x = 9, then

y = - \frac{1}{3} × 9 = - 3

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Answer:

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Step-by-step explanation:

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What is $20.00 less than 2.5 times the price of $64.80
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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

Taking square root on both sides

\sqrt{r^2} = \sqrt{25.477..}\\r = 5.0475\ cm

Now

C = 2\pi r

Putting the value of radius

C = 2 * 3.14 * 5.05\\C = 31.714\ cm

Hence,

The circumference of circle is: 31.714 cm

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Answer:

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Step-by-step explanation:

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