Chapter 9.1, Problem 5QR

To determine

To Calculate: The value of a given algebraic expression for the given values of the variables.

Answer to Problem 5QR

The value of the expression is $12$ .

Explanation of Solution

Given Information: The expression is $a{r}^{n-1}$ and the values of $a,r,n$ are $1.5,2,4$ respectively.

Method: Put the given values of variables in the given algebraic expression and then evaluate it.

Calculation: Put the values of the variables in the expression to get

  $a{r}^{n-1}=1.5\times 2^{4-1}$

  $=1.5\times 8$

  $=12$

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