A field is givenG= $\displaystyle \frac{25}{x^2+y^2}(x\hat{a}_x + y\hat{a}_y)$

Find

a.) unit vector in the direction G at (3,4,-2)

already answered :

by substitution

3a_x + 4a_y so unit vector is:

0.6a_x + 0.8a_y

b.) the angle between G and a_x at P

already answered :

arctan of (0.8/0.6)

this is my problem:

c.)Find the value of the double integral on the plane y = 7

i dont know how the limits are found

can someone help?

ans. 26