1) Joshua had $49,000 to invest. He divided the money into three different accounts. At the end of the year, he had made $2,600 in interest. The annual yield on each of the three accounts was 4%, 5.5%, and 6%. I f the amount of money in the 4% account was four times the amount of money in the 5.5% account, how much had he placed in each account?

2) Solve

x+y-7=z

4x-y+5z=4

2x+2y=3z

3.) x^2 +1 > 4x, solve