Dup= 72 miles
<span>ddown= 120 miles </span>
<span>v= riverspeed </span>
<span>rup= 32mph - v </span>
<span>rdown= 32mph + v </span>
<span>t both ways= t </span>
<span>d=r*t </span>
<span>d/r=t </span>
<span>t=ddown/rdown </span>
<span>t=dup/rup </span>
<span>dup/rup = ddown/rdown </span>
<span>(72)/(32-v)=(120)/(32+v) </span>
<span>3840-120v=2304+72v </span>
<span>1536=192v </span>
<span>v=8</span>
Answer:
The 3rd one
Step-by-step explanation:
I did this test and I got 100%
C is answer no explanation needed
Answer:
4
Step-by-step explanation:
When you add a positive number with a negative number, it technically turns into a subtraction equation. So, the easier way to look at the equation is 8-4=4
-4z+1 = bz+c
Take all z's to one side
1 = bz+c+4z
Then take c to the other side
1-c = bz+4z
Factor out z on the right side
1-c = z(b+4)
Then divide (b+4) from both sides
z = 1-c/b+4 or (1-c)/(b+4)
