Answer:
X from 0 to 21
Y from 0 to 7
Z from 0 to 3
Step-by-step explanation:
Since we are being asked by the integration limits in first octant (positive x, positive y and positive z) we need to know where does the plane intersect this axes. For this we have:
for x=0 and y=0
7z=21
z=3
for x=0 and z=0
3y=21
y=7
for z=0 and y=0
x=21
This means that the integration limits are:
(351.04, 368.96)
multiplying
100-3x
Well he has $100 and if each day he spends $3 we get the equation 100-3x giving us an expression we can use to calculate for any given day.
value of x = ( 1/7 ) or ( -7 )
here's the explanation in attachment.