Can someone help me pls

use this idea to add 5x^2+2x+3: +2x^2+7x+1
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Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Which expression is rational? 6. , square root two, square root 14, square root 49