Answer:
Step-by-step explanation:
1/7+1/13=1/t
multiply both sides by 7*13*t
13t+7t=7*13
21t=91
t=91/19
it will take 4 hours and 8 minutes
2.4
x 3
if x = 3 then the rational expression 4 / (x - 3) is undefined
because we get 4/0 = undefined .
C
I did this question today, pls lmk if u get it right
Reggies makes sence