1.
t²=81
t=9
2. r²-100=0
r²=100
[tex]\sqrt{ {r²}^{2} } = \sqrt{100} [\tex]
r=10
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Answers & Comments
1.
t²=81
t=9
2. r²-100=0
r²=100
[tex]\sqrt{ {r²}^{2} } = \sqrt{100} [\tex]
r=10