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This is Fractions

Solve the system of equations. y= 2x y= x^2 - 15

Find the value of x. give reasons to justify your solutions! c ∈ ae

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.