Write ratio as fraction in simplest form 27 feet to 8 yards?

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)