To get the answer we can use proportion.
30 ------------- 100%
12 --------------x
crossmultiply now
30x=12*100%
30x=1200% /:30 (divide both sides by 30)
x=40% - its the percentage of cars which finished the race.
100%-40%=60% - its the answer
For the equation f(x)=-2/3x+290, the y-int is 290 so you would plot that down on for positive 290 and from there rise upwards two times and run left 3 times for -2/3 is your slope.
The answer to the equivalence of mn+z is z+nm
