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°
7 1/5th is the anwser but thats easy your just being lazy i think
EDITED
Answer: x = 73.
Step-by-step explanation:
Angles on the same side of a line add up to 180.
As the angles 110 and (x-3) are on the same side of the line, you can solve for x using this equation:
![180 = 110 + (x-3)\\\\70 = (x-3)\\73 = x](https://tex.z-dn.net/?f=180%20%3D%20110%20%2B%20%28x-3%29%5C%5C%5C%5C70%20%3D%20%28x-3%29%5C%5C73%20%3D%20x)