3 years ago

If the diameter of a circle changes from 18 cm to 6 cm, how will the circumference change?

1 answer:

6 0

The circumference when the diameter is 18 = 18pi

The circumference when the diameter is 6 = 6pi

18pi/6pi=3

The circumference will become a third of what it was.

Hope this helps!

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Express answer as a mixed number <br> 14-(2/9)=

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Answer: 13.7777777778

Step-by-step explanation:

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3 years ago

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A positive real number is 6 less than another. If the sum of the square of the two numbers is 38, then finds the numbers.

Serggg [28]

Answer:

There seems to be a typo error but still this has solution.

Let the number be = x

A positive real number is 6 less than another. Means the second will be $(x+6)$

The sum of the square of the two numbers is 38.

$x^{2} +(x+6)^{2} =38$

=> $x^{2} +36+12x+x^{2} =38$

=> $2x^{2}+12x+36 =38$

=> $2x^{2}+12x=2$

=> $2x^{2}+12x-2=0$

Taking out 2 common;

=> $x^{2}+6x-1=0$

Solving this quadratic equation, we get;

$x=-3+\sqrt{10}$ and $x=-3-\sqrt{10}$

As positive number is needed, we have $-3+\sqrt{10}$

or x = $\sqrt{10}-3$

x = 0.162277

And other number is 6.162277.

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2 years ago

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Given P(A) = 0.8, P(B) = 0.51 and P(ANB) = 0.468, find the value of

masha68 [24]

Answer:

Step-by-step explanation:

P(BA)=P(B)+P(A)-P(AnB)

= 0.51+0.8-0.468

=1.31-0.468

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P(BA) = 0.842

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2 years ago

Is the number 144 rational or irrational?

Gelneren [198K]

The number 144 is rational because it can be expressed by 144/1

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3 years ago

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Julio is paid 1.4 times his normal hourly rate for each hour he works over 30 hours in a week.last week he worked 35 hours and e

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For 30 hours Julio is paid 30r dollars.

For the extra 5 hours he worked he earns 5*1.4r = 7r dollars

So the equation is

30r + 7r = 436.60

37r = 436.60

r = 436.60 / 37 = 11.80

His normal hourly rate is $11.80 answer

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3 years ago