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raketka [301]
2 years ago
15

Pleaseee help me with number eight,, I don’t know how to do it at all.

Mathematics
1 answer:
iogann1982 [59]2 years ago
5 0
1,200 because 4x 3 is 12 and 40 x 30=1,200
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 <span>Let r(x,y) = (x, y, 9 - x^2 - y^2) 

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= 28/5 + 40/9 - 1/4 
= 1763/180 </span>
6 0
3 years ago
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