The price of a radio was $20 it's on sale for $15 what is the percent of change in the price of a radio

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Ariel is working at a meat packing plant for 5 nights a week. her regular wage is $11 an hour. she earns tine and a half for any overtime hours. this week she worked 9 hours of over time .how much will ariel earn for overtime this week ?

Hell . what are the solutions to `10x^2 - 38x - 8 = 0`? is this when i find the factors and use the numbers within the factors to determine the zeros? i hope that made sense lol