Rates? Im 14 and a girl btw ;p

Is this a polynomial function? i need to know asap

Which letters from the table represent like terms? a and b b and c a and d b and d

Which equation shows the quadratic formula used correctly to solve 5x2 + 3x -4 0 for x? cos -3+ v (3) 2-4() 2(5) 3+ |(3)² +4() 205) 3+ (3) 2-4() -3+ v (3)² +4()