Find from first princepal of derivatives of cos3x

Abarbecue sold 26 hamburgers and hot dogs. hamburgers sell for $3.50 each and hot dogs sell for $2.00 each. if the barbecue made $70 in sales, determine and state the number of hot dogs sold.

38 points and brainliest plz answer question in word document

16x^2-16x=5 solve the equation by completing the square