Factor -49+4y2(difference of two squares)

What graph correctly matches the equation y equals two negative x

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?