If this is for real, the answer is 163,840 horses on the farm, because 4^2 is 16, and 16^3 is 4,096, and 4,096 times 40 is 163,840.
to solve this equation (4^2)^3*40 you can do this multiple ways, first off you can multiply 3*2 and get 6 so it could be 4^6 power, or you can solve for 4^2, then take that answer (16)^3 which would give you 4096 the you times this by 40 which gives you the answer 163840
