9.
l = length; w = width
[tex]l=2w+6 \\ 50=2w+6 \\ 50-6=2w+6-6 \\ 44=2w \\ 44/2=2w/2 \\ w=22[/tex]
Width = 22 m
10.
j = Junior's age; g = Grandpa's age
[tex]g=7j-9 \\ 75=7j-9 \\ 75+9=7j-9+9 \\ 84=7j \\ 84/7=7j/7 \\ j=12[/tex]
Junior's age = 12 years old
11.
b = Bill's weight; f = Father's weight
[tex]b= 10+ \frac{1}{2}f \\ 48=10+ \frac{1}{2} f \\ 48-10=10+ \frac{1}{2}f - 10 \\ 38= \frac{1}{2}f \\ 38*2= \frac{1}{2}f*2 \\ f=76 [/tex]
Father's weight = 76 kg
12.
o= Orange's calories; s = Sugar Krunchy's calories
[tex]o = \frac{1}{4}s-10 \\ 70= \frac{1}{4}s-10 \\ 70+10= \frac{1}{4}s-10+10 \\ 80= \frac{1}{4}s \\ 80*4= \frac{1}{4}s*4 \\ s = 320 [/tex]
Sugar Krunchy = 320 calories
13.Â
c = couch; x = chair
[tex]c=3x-16 \\ 200=3x-16 \\ 200+16=3x-16+16 \\ 216=3x \\ 216/3=3x/3 \\ x=72[/tex]
Chair = 72 cm
Hope this helps!
