Can someone help me solve this application quadratic problem? I’ll give brainlist to the correct solution

The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?

6cm10 cma conical paper cup has dimensions as shown in the diagram. how much water can the cup hold when full?

Solve the following: 12(x^2–x–1)+13(x^2–x–1)=25(x^2–x–1) 364x–64x=300x