X = low-energy lamp
y = high-energy lamp
1) 4x + 5y
2) 120= 4x + 5y
Answer:
Slope of the line DV = -1
Step-by-step explanation:
Let point D (-5, 1) be 
Let point V (-1, -3) be 

Plug in the appropriate values,

slope equals -1
Answer:
The durations of movies in minutes can only take on integer values from 0 to 60. Therefore, it is a discrete data.
The first quartile would be 48.5
Percent change = ((new value) - (old value))/(old value) × 100%
= (30 - 32.5)/32.5 × 100%
≈ -8%