I Need This Answer ASAP i) Find x if (5/2)2X+1 = (125/8)

ii) Find the error and correct it : (y - 3)2 = y2 - 9

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Math i have no idea how to do a and b