Multiply the -8 by the u divide the v by the w and you will get your answer
You cannot add -10y+9x or 10y+5x because of the rule “combine like terms”...
The correct answer is 8 because 8+4 equals 12
1/8 inch thick
inner diameter of 8.5
volume shell=volume total-volume shell
1/8=0.125
diameter/2=radius
radius inner=8.5/2=4.25
radiustotal=inner+outer=4.25+0.125=4.375
so
Vouter-Vinner=(4/3)pi4.375³-(4/3)pi4.25³
Vshell=(4/3)(pi)(4.375³-4.25)
Vshell=(4/3)(pi)(83.740234375-76.765625)
Vshell=(4/3)(pi)(6.974609375)
Vshell=9.299479166666666666666pi cubic inches
Vshell≈16.433536180619 cubic inches
5x=-10-5y
Add 5y for both side
5x+5y=-10
-
5x+10y=-25
=
-5y=15
Divided -5 for both side
y=-3
5x+10y=-25
5x+10(-3)=-25
5x-30=-25
Add 30 for both side
5x=5
Divided 5 for both side
x=1. Hope it help!
