Chapter 1.2, Problem 32PPS

To determine

To evaluate: the given expression

Answer to Problem 32PPS

The numerical value of the given expression is 71

Explanation of Solution

Given:

x = 9, y = 4, and z = 12.

  $7z-\left(y+x\right)$

Calculation:

Replace x with 9, y with 4 and z with 12

  $7z-\left(y+x\right)=7\cdot 12-\left(4+9\right)$

Evaluate $\left(4+9\right)$ first

  $=7\cdot 12-13$

Here, $7\cdot 12$ Means $7\times 12$

  $=84-13$ Subtract13 from 84

  $=71$

Conclusion:

Thus, the numerical value of the given expression is 71