3 years ago

Use properties to evaluate 7/5(1/4 divide 7/4)(-10)

Mathematics

1 answer:

cricket20 [7]3 years ago

3 0

The answer isssssss c -2

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The sum of the circumference of two circles is 38π cm and the sum of their areas is 193π cm². Calculate the radii of the circles

sdas [7]

Answer:

The radii of the circles are 12 cm and 7cm.

Step-by-step explanation:

Let the radii of the circles be $r_{1}\ and\ r_{2}$

Given:

Sum of circumference of two circles= 38π cm

Formula for circumference of a circle with radius r = 2πr

$2\pi r_{1}+2\pi r_{2}=38\pi \\r_{1}+r_{2}=19$ ------------1

Sum of areas of two circles= 193π cm²

Area of circle with radius r = πr²

$\pi r_{1}^{2}+\pi r_{2}^{2}=193\pi \\r_{1}^{2}+r_{2}^{2}=193$ -------2

Substituting r2 = 19 - r1 in equation 2 we get:

$r_{1}^{2}+(19-r_{1})^{2}=193\\2r_{1}^{2}-38r_{1}+168=0\\r_{1}^{2}-19r_{1}+84=0\\(r_{1}-12)(r_{1}-7)=0\\r_{1}=12\ or\ 7$

Then r2 = 19 - r1

$r_{2}=12\ or\ 7$

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3 years ago

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IRINA_888 [86]

24 1/2. 0.5 is equal to 1/2

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Write the equation of the parabola in vertex form.<br> vertex (2.4), point (3. - 3)

Kobotan [32]

Answer:

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Step-by-step explanation:

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Finding the x- and y - intercept equation of 3x-y=12

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Answer:

Step-by-step explanation:

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haha Bella is my nickname

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