What is the answer or solution to the regarding question two thirds minus 1

Fiona races bmx around a circular dirt course. if the radius of the course is 70 meters, what is the total distance fiona covers in two laps of the race? a. about 30,772 meters b. about 15,386 meters c. about 879.2 meters d. about 439.6 meters e. about 219.8 meters23 points hurry

For what value of (y) is 3^3/3^y =1/9

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15