Question

1.5.PS-9Question HelpError Analysis Simplify the expression - 1.8+(-1.2). On the test, when Tom simplified theexpression he got 0.6. What mistake did Tom likely make when he simplified the expression?- 1.8+(-1.2) = 1 (Type an integer or a decimal.)

Answer 1

Answer:

-3.0

Explanation:

First, we open the bracket and take note that:

$+\times-=-$

$\begin{gathered} -1.8+\left(-1.2\right)=-1.8-1.2 \\ =-3.0 \end{gathered}$

Next, we determine Tom's mistake.

$\begin{gathered} 1.8+(-1.2)=1.8-1.2 \\ =0.6 \end{gathered}$

Therefore, the mistake Tom made was that he ignored/forgot the negative sign before 1.8.