Question 1107421
let K equal the number of hours that kyle's cell phone battery lasts.
let B equal the number of hours that his brother's cell phone battery lasts.


kyle's battery last at least twice as long as the battery for his brother's cell phone.


that gets you K >= 2 * B.


his brother's battery lasted 8 hours.


that gets you K >= 2 * 8 which gets you K >= 16.


your selections are shown as:


A. K < 2  8 
B. K  2  8
C. 2K > 8 
D. 2K  8


you're mising some key operands.
my guess as to what they are is shown below:


A. K <= 2 * 8 
B. K >= 2 * 8
C. 2K >= 8 
D. 2K <= 8


without knowing exactly what your final equations are like because of the missing operands, i would guess that selection B would be correct, because:


K >= 2 * B
B = 8
this results in K >= 2 * 8.