Question

A charging station can only charge cell phones and laptops. Cell phones use approximately 3 joules per second (J/s) when charging, and laptops use approximately 40J/s when charging. Which of the following equations represents the relationship between the number of cell phones, c, and the number of laptops, l, that could be charging when the station's output is exactly 160J/s?

a. c= -40l+160
b. c= -40/3 l +160/3
c. c= -3 l + 160
d. c= -3/40 l + 160/40

Answer 1

The relationship between the number of cell phones and laptops that can be charging when the station's output is exactly 160J/s is represented by the equation: c = -40/3 * l + 160/3.

Step-by-step explanation:

The relationship between the number of cell phones, c, and the number of laptops, l, that could be charging when the station's output is exactly 160J/s can be represented by the equation:

c = -40/3 * l + 160/3

This equation takes into account the energy usage of cell phones and laptops while charging. The negative coefficient in front of l indicates that as the number of laptops increases, the number of cell phones that can be charging decreases, given a fixed total output of 160J/s.