Answer:
d) Before cooling begins, the temperature of the water is 22°C
Step-by-step explanation:
Option A
If t=7 minutes
D=-7/5t+22
=-7/5(7)+22
=-49/5+22
=-49+110/5
=61/5
=12.2°C
Change in temperature=12.2°C-22°C
=-9.8°C
Option B
If t=5 minutes
D=-7/5t+22
=-7/5*5+22
=-7+22
=15°
Change in temperature=15°-22°
=-7°
Option C
The temperature of the ice must be less than 22°C
Option D
D=-7/5t+22
When ice is not placed, t=0
D=-7/5t+22
=-7/5(0)+22
=0+22
=22
Temperature of the water before cooling=22°
Answer:
12
Step-by-step explanation:
The proportion is equal to ![\frac{x}{10}=\frac{42}{35}](https://tex.z-dn.net/?f=%5Cfrac%7Bx%7D%7B10%7D%3D%5Cfrac%7B42%7D%7B35%7D)
We can simplify the right side by dividing by 7/7 to get the right side equal to 6/5. Now we can cross-multiply to get
![60=5x](https://tex.z-dn.net/?f=60%3D5x)
Dividing both sides by 5, we have the answer as
![x=12](https://tex.z-dn.net/?f=x%3D12)
Hey!
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I'm going to assume that the equation is 6 + (-5 - 7)
~Solve what's in parenthesis
6 + (-12)
~Simplify
6 - 12
~Subtract
-6
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Hence, the answer is ![\Large\boxed{\mathsf{-6}}](https://tex.z-dn.net/?f=%5CLarge%5Cboxed%7B%5Cmathsf%7B-6%7D%7D)
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Hope This Helped! Good Luck
Answer:
0.2 or 1/5
Step-by-step explanation:
Answer:
The y intercept is (0,1.69) and not (0,169)
Step-by-step explanation:
substituting, y=-1(x+1.3)(x-1.three) observe that this is distinction of squares y=-[x2-(1.3)2] , y=-(x2-1.69), y=-x2+1.69