all of them.
every month has 28 days. some just continue on after reaching 28.
all real numbers are solutions in both.
step 1: simplify both sides of the equation.
step 2: subtract 25x^2 from both sides.
step 3: add 25x to both sides.
step 4: add 25 to both sides.
not sure if there're any answer choices of some sort,
but if the angle a and angle b are supplementary, that means when you add their measures together they must equal 180.