Pl hurry x+y=12 and 20x+35y=315 what is the solution to the system of equations? (3, 9) (6, 6) (7, 5) (11, 1)

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In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

If f(x)=3 over x+2 - square root x-3 then f(7)=