6) The parabola y = x2 + bx + c is symmetric with respect to the line x = 5. Find the value of b.

Find the area of the regular hexagon if a side is 20 cm.

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.

Idon’t know what to do after i plot my first shape