3/10 due to there being 10 marbles (for white) for blue 7/10
Answer:
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Rotate by angle α = 90°, around a center point (0; 0)
Answer:
9
Step-by-step explanation:
7r+18=r²
r²-7r-18=0
factorizing
r²+2r-9r-18=0
r(r+2)-9(r+2=0
(r-9)(r+2)=0
r-9=0
r=9
check
(r²)=(9*9)=81
7r+18=7(9) + 8=81