Answer:
sum of the polynomials is 
Step-by-step explanation:
Given polynomial is (7 x^3– 4 x^2) + (2 x^3 +3 x)
adding x^3 terms, now we get


Therefore the sum of given polynomial is

Answer:
Step-by-step explanation:
To find the answer we must take the LCM of 2,4 & 5.
LCM= 20
∴All animals will land together on the 20th stone.