Try this solution:dy/dx=y⁴cosx; y⁻⁴dy=cosxdx;

Answer:
W= 2
Step-by-step explanation:
The point (8,2,9) is in the first octant.
The closest distance from the coordinate planes is the value y=2, which will therefore be the maximum radius of the required sphere.
The standard equation of a sphere with radius r and centre (u,v,w) is given by
(x-u)^2+(y-v)^2+(z-w)^2=r^2
Substituting r=2, u=8, v=2, w=9, we get the equation of the required sphere
(x-8)^2+(y-2)^2+(w-9)^2=2^2
The man’s original salary was 100%. when increased by 10% , it becomes 110% which is $154 000.
so,
110% -> 154 000
1% -> $1400
100% -> $1400 x 100
= $140 000