Chapter 1.6, Problem 49E

To determine

To justify : The fact that $5-6=-1$

Explanation of Solution

The answer is , One-part ethylene glycol with three-part water solution has the lower freezing point, it is $-24°C$ lower

Given information: to justify the fact that $5-6=-1$ .give an argument similar to that of page 34 for the difference of $5-\left(-2\right)$ .

Proof:

Hence, it is proved as

$\begin{array}{l}5-6\\ =-6+5\end{array}$ [can be written]

[the integer 6 has negative sign and the integer 5 has a positive sign, one negative and one positive sign implies that subtraction needs to be done. After subtraction, the sign of the highest integer is given the priority]

So, the answer is $-1$