k=-3 Try using a technique DLAM, Distributive property,like terms, Add/subtract (if its positive,make it a negative) and variables (divide your result from the last step.)
E+r=
(e=9)
r=1.50)
or 9+1.50=
I think
The answer is the second one V = 80w because every number on the volume section divided by every number on the width section equals 80
Example 400 divided by 5 = 80<span />
Large box 70, small 55
x+y=125
40x+20y=3900
y=125-x
40x+20(125-x)=3900
40x+2500-20x=3900
20x=1400
x=70
125-70=y
y=55
