Which expression is equal to the expression below? -4x(2x-3)+ 10x²

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Dawn is selling her mp3 player for 3 4 of the original price. the original price for the mp3 player was $40. how much is she selling her mp3 player for?