Monique P.

asked • 04/07/18

Please help with this question

We can use the formula r=√S/12.6 to relate a ball's surface area S (in square inches) to its radius r (in inches). Suppose a ball has a surface area of 415.8 square inches. What is its radius?

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Arturo O. answered • 04/07/18

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r ≅ √(S/12.6) = √[(415.8 in2)/(12.6)] = ? inches
 
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Andy C.

Hello Arturo!
 
  I found the matrix we were looking for...
 
      [   4    0     7          ] 
      [   4    3     1          ]
      [   5    7     9    4    ]
 
Thanks
 
 
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04/08/18

Arturo O.

Yes!  That solves part (a) of that problem.  For part (b) I get
 
[3   2   1      ]
[4   7   3      ]
[8   1   1    5]
 
 
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04/08/18

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