Posted by Christine on .
The amount of light emitted from a battery indicator bulb pulses while the battery is charging. This can be modeled by the equation y = 60+60sin[(pi/4)t] , where y is the lumens emitted from the bulb and t is the number of seconds since the beginning of a pulse. At what time will the amount of light emitted be equal to 110 lumens?

Algebra 2 Honors 
Reiny,
mhh, aren't we just solving
60 + 60sin[(π/4)t] = 110 ?
sin[(π/4)t] = .833333
make sure your calculator is set to radians
[(π/4)t] = .98511
t = .....
let me know what you got 
Algebra 2 Honors 
Christine,
im stupid

Algebra 2 Honors 
Christine,
1.25 is what i got

Algebra 2 Honors 
Reiny,
correct!
good job 
Algebra 2 Honors 
Christine,
THANK YOU!