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Mathematics 9 Online
OpenStudy (anonymous):

PLEASE HELP ME

OpenStudy (anonymous):

Nnesha (nnesha):

ok again just plug there value int the formula

Nnesha (nnesha):

what you get @judtpleasegahd

sammixboo (sammixboo):

Well first to help you can find out what 880 * pi is :P What is 880 * 3.14?

OpenStudy (anonymous):

2763.2

OpenStudy (anonymous):

28?

sammixboo (sammixboo):

Yes so we know the SA is 2763.2 cm squared. SA = 2 * 3.14 * \(\rm r^2\) + 2 * 3.14 * rh Now we plug in the information below where it belongs in the formula above. Radius ( r ) - 8 Surface Area ( SA ) - 2763.2 2763.2 = 2 * 3.14 * \(\rm 8^2\) + 2 * 3.14 * 8h

sammixboo (sammixboo):

Now first do the exponents. The only exponent is \(8^2\) which is 8 * 8 So what is 8 * 8

OpenStudy (anonymous):

64

sammixboo (sammixboo):

Please let the asker answer, thanks :) But yes it is 64, now we plug in 64 where \(8^2\) was in the equation. 2763.2 = 2 * 3.14 * \(8^2\) + 2 * 3.14 * 8h 2763.2 = 2 * 3.14 * 64 + 2 * 3.14 * 8h Now we must multiply from left to right, so we start with 2 * 3.14 What is 2 * 314?

sammixboo (sammixboo):

2 * 3.14 not 314 sorry!

OpenStudy (anonymous):

6.28

sammixboo (sammixboo):

Nope 8 * 8 = 64 :P 8 + 8 = 16

Nnesha (nnesha):

8 times 8 is 64 8 + 8 is 16

OpenStudy (anonymous):

2763.2=2*3.142*8(8+h) 2763.2=50.272(8+h) 2763.2/50.272=8+h 54.96=8+h h=54.96-8 h=46.96

sammixboo (sammixboo):

Correct! now we plug in 6.28 where 2 * 3.14 was in the equation..! 2763.2 = 2 * 3.14 * 64 + 2 * 3.14 * 8h 2763.2 = 6.28 * 64 + 2 * 3.14 * 8h Still multiplying from left to right, now we multiply 6.28 and 64 So what is 6.28 * 64?

OpenStudy (anonymous):

401.92

sammixboo (sammixboo):

Zain I said once. Please let the asker answer :) Thanks

OpenStudy (anonymous):

401.92

OpenStudy (anonymous):

as i have taken common in above solution

OpenStudy (anonymous):

ok @sammixboo

OpenStudy (nirmalnema):

sammixboo (sammixboo):

But yeah it equals 401.92 So plug in 401.92 where 6.28 * 64 was :) 2763.2 = 6.28 * 64 + 2 * 3.14 * 8h 2763.2 = 401,92 + 2 * 3.14 * 8h Now STILL multiplying left from right, we multiply 2 and 3.14 What is 2 * 3.14?

Nnesha (nnesha):

nice writing

OpenStudy (nirmalnema):

thanks.. :)

OpenStudy (nirmalnema):

lol...

OpenStudy (anonymous):

thanks everyone

OpenStudy (nirmalnema):

welcome..!

OpenStudy (anonymous):

The volume for a rectangular prism is given by the formula V = l · w · h, where l is the length of the prism, w is the width of the prism, and h is the height of the prism. The volume of a rectangular prism is 729 cubic inches. If the length and height are 9 inches each, what is the width of the rectangular prism? 81 inches 711 inches 72 inches 9 inches

OpenStudy (anonymous):

@judtpleasegahd check mine solution

OpenStudy (anonymous):

V=l . w .h 729=9 . w. 9 729=81 .w 729/81=w 9=w

OpenStudy (anonymous):

D

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