Answer:

where R is the R-value and t is the thickness in inches.
Step-by-step explanation:
We are given the following in the question:
The R-value of fiberglass insulation and f its thickness have a linear relation.
Let R be the R-value and t be the thickness. Then, the equation can be written as:

where a and b are constants.
When t = 3.5, R = 11

When t = 6, R = 19

Solving the two equation, using the elimination method, we have,

Thus, the linear relationship is given by:

where R is the R-value and t is the thickness in inches.
Its 12, becuse if its a Circle then you can look at it the same way you look at a clock which has 12 numbers on it and 4 and 11 are directly across each other.
D=rt
d/r=t
d=171
r=17
171/19=t=9
9 minutes is the answer
Answer:
H-20=H-24/2+13
H-20=H-24+26/2
2(H-20)=H-24+26
2H-40=H+2
2H-H=2+40
H=42
Step-by-step explanation:
Answer:
1
Step-by-step explanation:
Hope this helpsss