Answer:
B
Step-by-step explanation:
Substitute y
3(6x+2)-18x=12
18x+12-18x=12
18x-18x=0
0=0
Solution: Infinitely many solutions
Hoped this helped!<span />
Answer:
No way...by the way this question has only 5 points... ://
Answer:
Return trip travel time: 7h
Step-by-step explanation:
Let d be the distance.
Index 1 refers to initial trip, index 2 refers to the return trip.
v1=70mi/h
v2=40mi/h
t2=t1+3h, or t1=t2-3h (travel times)
d=v1×t1=v2×t2
v1×(t2-3)=v2×t2
v1 t2 -3 v1=v2 t2
v1 t2 - v2 t2=3 v1
t2(v1-v2)=3v1
t2=3v1/(v1-v2)
Or
t2=3×70/(70-40)=3×70/30=7h
The frequency stays the same and the wavelength decreases.
