5.104+4.103+7.10+1=
9.207+7.10+1=
16.307+1=
17.307
We have to solve for f:
2 + 1.25 f = 10 - 2.75 f
1.25 f + 2.75 f = 10 + 2
4 f = 12
f = 12 : 4
f = 3
Answer: f = 3
Let the number be x
3x + 5 = 20
3x = 20 - 5
x = 15/3
x=5
Answer:
soln
A=(9,j)
x1=9,y1=j
B=(10,4)
x2=10,y2=4
slope=1
by using the fomulaof slope,
slope=y2-y1/x2-x1
1 =4-j/10-9
1 = 4-j/1
1=4-j
j=4-1
j=3
Equating the formula (d is the diameter)

d^2/4 = 132.7
d^2 = 132.7*4/

d =

d = 13.0017147331
d= 13cm