−4°C, 3°C, −6°C, 0°C, 5°C, −1°C, 7°C n Which is the lowest foretasted temperature?

-4 would be the lowest

Step-by-step explanation:

because The temperature of a body is a measure of the energy of the submicroscopic random motions of the constituent molecules. The minimum possible energy of motion is zero: no motion. We call that absolute zero. In quantum mechanics there’s always some motion, so zero becomes the minimum possible energy of motion of the body. This minimum energy can be altered for example by an external magnetic field, so the zero of temperature is not really perfectly absolute. Depending on what you call zero, changing external conditions might make the real minimum energy a little more or less than that.

The answer is: they are not parallel because they do not share the same slope. 

 Facts: 
1. Two parallel lines share the same slope.
2. To determine a slope, express the equations in this form: 
3. m = slope 
The slope of  is zero, because it represents a horizontal line in the cartesian plane.
We know that a slope = rise/run... in this case there is no rise and the run goes to infinity (+ and - directions). When zero is divided by any number, the result is zero... thus the slope is zero.