Hallar el 5% de 20+80% de 47+25% de 89+50% de 550.

Plz determine whether the polynomial is a difference of squares and if it is, factor it. y2 – 196 is a difference of squares: (y + 14)2 is a difference of squares: (y – 14)2 is a difference of squares: (y + 14)(y – 14) is not a difference of squares

Can someone me do math because i am having a breakdown rn because i don’t get it

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?