Evaluate the Expression: 7.5 + (-9.5) + 5 + (-13.5)

7.5+(−9.5)+5+(−13.5)=? 7.5+(-9.5)+5+(-13.5)=\text{?}

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Step-by-step video solution

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00:00 Arrange the signs in the exercise
00:02 The addition of two minuses results in a minus
00:11 The addition of two minuses results in a minus
00:21 Addition and subtraction - solve from left to right

Step-by-step written solution

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1

Understand the problem

7.5+(−9.5)+5+(−13.5)=? 7.5+(-9.5)+5+(-13.5)=\text{?}

2

Step-by-step solution

Let's begin by expanding the parentheses whilst paying attention to the minus and plus signs, which change accordingly:

+(−9.5)=−9.5 +(-9.5)=-9.5

+(−13)=−13 +(-13)=-13

We should obtain the following:

7.5−9.5+5−13.5= 7.5-9.5+5-13.5=

Now let's solve the exercise from left to right:

−2+5−13.5= -2+5-13.5=

3−13.5=−10.5 3-13.5=-10.5

3

Final Answer

−10.5 -10.5

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\( 9 \times (2 \times 1) = \)

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