Can I please please get help with this?

What is the radical expression that is equivalent to the expression 27 1 over 5?

What classification best describes 5x+10y+15z=60 2x+4y+6z=60 x+2y+3z=60

Elena's aunt bought her a $150 savings bond when she was born when elena is 20 years old the bond will have earned 105% in intrest how much will the bond be worth when elena is 20 years old