Answer:
No idea sorry we have not learned this yet
Answer:
C(t)= D-(30Dt/100)
Step-by-step explanation:
C(t)= 120-(30*120*1h)/100 C(t)=84
C(t)= 120-(30*120*2h)/100 C(t)=48
C(t)= 120-(30*120*3h)/100 C(t)=12
Answer:
C.
Step-by-step explanation:
Square, Oval, Rectangular, Circle
Follow meee
S = d/t
st = d
t = d/s
The time going is t1.
The time returning is t2.
The total time is 4 hours, so we have t1 + t2 = 4
The speed of the current is c.
The speed going is 9 + c.
The speed returning is 9 - c.
t1 = 16/(9 + c)
t2 = 16/(9 - c)
t1 + t2 = 16/(9 + c) + 16/(9 - c)
4 = 16/(9 - c) + 16/(9 + c)
1 = 4/(9 - c) + 4/(9 + c)
(9 + c)(9 - c) = 4(9 - c) + 4(9 + c)
81 - c^2 = 36 - 4c + 36 + 4c
81 - c^2 = 72
c^2 = 9
c^2 - 9 = 0
(c + 3)(c - 3) = 0
c + 3 = 0 or c - 3 = 0
c = -3 or c = 3
We discard the negative answer, and we get c = 3.
The speed of the current is 3 mph.
Welllll i don’t really know I just need points so I hope you get a correct answerrrr!!!
