Answer:
best way would be calendar
Step-by-step explanation:
then stop watch
heartbeat
finding height?
(im not totally sure because it depends what type of timekeeping you're talking about)
x2 = -13x - 4=
2x = -13x - 4=
2x+13x=-13x-4+13x
15x=-4
x=4/15
i hope this is correct
