Chapter 1: Q 120. (page 39)

In the following exercises, evaluate each expression.
$x + (- 21)$ when
(a) $x = - 27$
(b) $x = 44$

Short Answer

Expert verified

(a) $- 48$

(b) 23

Step by step solution

Part (a). Step 1. Given Information:

The given expression is $x + (- 21)$ and the value of the variable is $x = - 27$ .

Part (a). Step 2. Substitute the values:

Substitute $- 27$ for $x$ into the given expression $x + (- 21)$ .

$- 27 + (- 21)$

Part (a). Step 3. Perform Addition:

Add $- 27$ and $- 21$ in the obtained expression.

$- 27 + (- 21) = - 48$

Part (a). Step 4. Conclusion:

The value is $- 48$ .

Part (b). Step 1. Given Information:

The given expression is $x + (- 21)$ and the value of the variable is $x = 44$ .

Part (b). Step 2. Substitute the values:

Substitute 44 for $x$ into the given expression $x + (- 21)$ .

$44 + (- 21)$

Part (b). Step 3. Perform Subtraction:

Rewrite the obtained expression using the subtraction property $a + (- b) = a - b$ .

$44 + (- 21) = 44 - 21$

Subtract 21 from 44.

$44 - 21 = 23$

Part (b). Step 4. Conclusion:

The value is 23.

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In the following exercises, evaluate each expression.
$x + (- 21)$ when
(a) $x = - 27$
(b) $x = 44$

Short Answer

Step by step solution

Part (a). Step 1. Given Information:

Part (a). Step 2. Substitute the values:

Part (a). Step 3. Perform Addition:

Part (a). Step 4. Conclusion:

Part (b). Step 1. Given Information:

Part (b). Step 2. Substitute the values:

Part (b). Step 3. Perform Subtraction:

Part (b). Step 4. Conclusion:

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In the following exercises, evaluate each expression.x+-21when(a) x=-27(b)x=44

Short Answer

Step by step solution

Part (a). Step 1. Given Information:

Part (a). Step 2. Substitute the values:

Part (a). Step 3. Perform Addition:

Part (a). Step 4. Conclusion:

Part (b). Step 1. Given Information:

Part (b). Step 2. Substitute the values:

Part (b). Step 3. Perform Subtraction:

Part (b). Step 4. Conclusion:

One App. One Place for Learning.

Most popular questions from this chapter

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In the following exercises, evaluate each expression.
$x + (- 21)$ when
(a) $x = - 27$
(b) $x = 44$