Ineed with these 4 problems. due tomorrow ! you : ) 15 points!

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Average acceleration: i have no idea how to do this.

Mike wants to make meatloaf. his recipe uses a total of 8 pounds of meat. if he uses a 3 to 1 ratio of beef to pork, how much pork will he use? enter your answer as a mixed number in simplest terms.