k should be 1, Check by calculating the x values for f(x) and confronting them with g(x)
V=(LxWxH)/3 so, V= (9x12x15)/3 = 1,620/3 = 540m^3. From here you multiply 540m^3 by 3,000kg/m^3 and get 1,620,000kg. Then you divide 1,620,000kg by 2,000kg/metric tonne and get 810 metric tonnes.
3x+x=y
3(-3)+(-3)=y
-9-3=y
-12=y
Therefore the value of x3+x is -12
Linear: third graph from the left
Quadratic: fourth graph from the left
Exponential: first graph from the left
To find this out, look at the type of graft and then its factors.