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Q21.

Expert-verifiedFound in: Page 7

Book edition
Common Core Edition

Author(s)
Ron Larson, Laurie Boswell, Timothy D. Kanold, Lee Stiff

Pages
183 pages

ISBN
9780547587776

**Evaluate the experssion when $a=4,\u200ab=2,\text{and}c=16$**

**localid="1647950190566" $\u200ac-a$**

The value of the expression is $12$.

Two numbers with similar signs get added and the resulting number carries the similar sign.

Two numbers with opposite signs get subtracted and the resulting number carries the sign of the larger number.

If two positive numbers 2 and 3 are being added, then the resulting sum will be $2+3=5$, which is positive as well.

And if two negative numbers $-2$ and $-3$ are being added, then the resulting sum will be $\left(-2\right)+\left(-3\right)=-5$, which is negative as well.

The difference of the numbers $7-3=4$ is positive because the larger number is positive as well.

And the difference of the numbers $3-7=-4$ is negative because the larger number is negative as well.

To evaluate the expression $c-a$, substitute the values of *a* as 4 and value of *c* as 16 and subtract the numbers as shown below,

$\begin{array}{l}c-a\\ =16-4\\ =12\end{array}$

Thus, the value of the expression is $12$.

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