A. has mass and takes up space :)
1/5 of an hour is 12 minutes. 60 seconds x 12 minutes= 720 seconds

x equals 25% of the cost.
.25 equals 25%
Therefore x=12
The awnser is $12
19/8 is the improper fraction of 2 3/8.
F(x)=3x^2 - 2x +1
f(-1)=3(-1)^2-2(-1)+1
f(-1)=3( 1 ) +2+1
f(-1)=3+3
f(-1)=6