which is the better buy? 7 - centimeter piece of copper pipe for $0.42, 2 - centimeter piece of copper pipe…

Explanation:

Step1: Calculate unit - price of 7 - centimeter pipe

To find the unit - price, divide the total price by the length. For the 7 - centimeter pipe, the unit - price is $\frac{0.42}{7}=0.06$ dollars per centimeter.

Step2: Calculate unit - price of 2 - centimeter pipe

For the 2 - centimeter pipe, the unit - price is $\frac{0.13}{2}=0.065$ dollars per centimeter.

Step3: Compare unit - prices

Since $0.06<0.065$, the 7 - centimeter pipe has a lower unit - price.

Answer:

The 7 - centimeter piece of copper pipe for $0.42$ is the better buy.