Chapter 1.5, Problem 31SR

(a)

To determine

To calculate:To write an algebraic expression to find the number of nickels in any number of dollars $n$

Answer to Problem 31SR

Expression to find number of nickels in any number of dollars $n$ is $20n$

Explanation of Solution

Given information:There are $20$ nickels in one dollar

Calculation:

Number of nickels in one dollar $=20$

Thus, number of nickels in $n$ dollars $=20\times n$

  $=20n$

Therefore, algebraic expression to find number of nickels in any number of dollars $n$ is $20n$

(b)

To determine

To calculate: To find number of nickels in $\$7.00$

Answer to Problem 31SR

Number of nickels in $\$7.00$ are $140$

Explanation of Solution

Given information: There are $20$ nickels in one dollar and given dollar is $\$7.00$

Calculation:

Number of nickels in one dollar $=20$

Thus, number of nickels in $n$ dollars $=20\times n$

  $=20n$

Therefore, algebraic expression to find number of nickels in any number of dollars $n$ is $20n$

Now, number of nickels in $\$7.00$ is calculated as

  $\begin{array}{l}\Rightarrow 20\times 7.00\\ \Rightarrow 140\end{array}$

Thus, number of nickels are $140$