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Pre-Algebra
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2v+7=3
2v=3-7
2v=-4
v=-4:2=>v=2

4b+3=-9
4b=-9-3
4b=-12
b=-12:4=> b=-3

17=5k-2
17+2=5k
19=5k
k=19:5
k=3.8

-6t-7=17
-6t=17+7
-6t=24
t=24:(-6)
t= -4

8n + 16.2=1.6
8n=1-6-16.2
8n=-14.6
n=-14.6:8
n=-1.8

-5g+2.3=-18.8
-5g=-18.8-2.3
-5g=-21.1
g= -21.1:(-5)
g=4.2

2t-5=-10
2t=-10+5
2t=-5
t=-5:2
t=-2.5

-4p + 9=-5
-4p=-5-9
-4p=-14
p=-14:(-4)
p= 3.5

11=5x-2
11+2=5x
13=5x=>5x=13
x=13:5
x=2.6

4+2.2h=-3.7
2.2h=-3.7-4
2.2h=-7.7
h=-7.7:2.2
h=-3.5

-4.8f+6.4=-8.48
-4.8f=-8.48-6.4
-4.8f=-14.88
f= -14.88:(-4.8)
f=3.1

7.3y-5.18=51.9
7.3y=51.9+5.18
7.3y=57.08
y=57.08:7.3
y=7.8

If the diameter is 8 than the radius is 4 because 2r or 2*radius equals the diameter. 4*2=8. 8/2=4.