9 or 12 I think Possibly 18
Answer:
21.68 minutes ≈ 21.7 minutes
Step-by-step explanation:
Given:

Initial temperature
T = 100°C
Final temperature = 60°C
Temperature after (t = 3 minutes) = 90°C
Now,
using the given equation

at T = 90°C and t = 3 minutes


or

taking the natural log both sides, we get
3k = 
or
3k = -0.2876
or
k = -0.09589
Therefore,
substituting k in 1 for time at temperature, T = 65°C

or

or

or

taking the natural log both the sides, we get
( -0.09589)t = ln(0.125)
or
( -0.09589)t = -2.0794
or
t = 21.68 minutes ≈ 21.7 minutes
Answer:
y=-1/8y+1
Step-by-step explanation:
flip the equation, then add -8 to both sides to cancel out the +8 on the left, then divide sides by -8Let's solve for x.
y=−8x+8
Step 1: Flip the equation.
−8x+8=y
Step 2: Add -8 to both sides.
−8x+8+−8=y+−8
−8x=y−8
Step 3: Divide both sides by -8.