Solve each equation by factoring, by taking square roots, or by grouping. When necessary round to the nearest hundredth.

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

Which of these angles are supplementary? a. 100o and 90o b. 78o and 102o c. 54o and 146o d. 12o and 78o

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.