If using the method of completing the square to solve the quadratic equation x^2−19x+23=0, which number would have to be added to "complete the square"?

How do i do this activity, is appreciated

Which ratios are equivalent to 10: 16? check all that apply. 30 to 48 25: 35 8: 32 5 to 15

Me! i will mark you brainliest if you are right and show your i don't get polynomials and all the other stuff. multiply and simplify.2x(^2)y(^3)z(^2) · 4xy(^4)x(^2)show your