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what’s the answer too, must get the answer 12.9

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

What is the surface area of the sphere?

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.