Answer:
20 weeks
Explanation:
Let the total number of weeks needed to bring down the weight to 45 = w
Weight lost per week = 0.5
Hence the our function will be
45=55-0.5w
0.5w=55-45
w=\frac{10}{0.5}
w=20
Hence Rocco is going to attain weight of 45 p in 20 weeks and the function as per vet advice wil be
f(x) or P=55-0.5w