Consider the following. f(x, y) = x/y, P(7, 1), u = 3 5 i + 4 5 j (a) Find the gradient of f. ∇f(x, y) = (b) Evaluate the gradient at the point P. ∇f(7, 1) = (c) Find the rate of change of f at P in the direction of the vector u. Duf(7, 1) = Need Help? Read It

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation:

27 +27 or 27times 2=54

the diffrence is 0