. The sale price of a necklace was $77. It had been marked down 30 percent for the sale. What was the original price of the necklace?

Could somebody me with this radical simplification?

The statements below can be used to prove that the triangles are similar. ? △abc ~ △xyz by the sss similarity theorem. which mathematical statement is missing? ∠b ≅ ∠y ∠b ≅ ∠z

Answer asap! urgent! will give brainliest!