Answer:
Teachers are idiots that's why :)
You simply divide 678 by 3 and get 226.
Da number is n
2n-(n/2)≥12
times both sides by 2
4n-n≥24
3n≥24
divide both sides by 3
n≥8
She has to save $623.75 a month to get that amount of money!
Use the pythagorean theorem a.k.a

c is the hypotenuse while a & b are the legs


subtract 225 from 289

square root both b and 64
the other leg is equal to 8