Answer:
C=58
Explanation:
Do 35 minus 12 and you get 23. Add 23 to 12 and you get 35. Add 23 to 35 and you get 58.
306.25 i think
Magic C is (b/2)^2 or as i learned (b^2)/4 so b=35 35/2= 17.5 and 17.5^2= 306.25 hope it helped : )
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