2500 = 2x + 350
2500 - 350 = 2x
2150 = 2x
2150/2 = 2x/2
1025 = x
x = $ Todd had earned
<span>Let m = speed of motorboat
and c = speed of current
.
When going downstream, current speed is added to boat speed -- and, the total speed is "8 miles downstream in 20 minutes"
.
To convert to "miles per hour" we multiply by 60 mins per 1 hour:
(8 miles/20 mins) * (60 mins/1 hour) = 24 mph
.
This gives us our first equation (1):
m+c = 24
.
When going upstream, the boat speed is reduced by the current -- and, the total speed is "8 miles in 30 minutes".
To convert to "miles per hour" we multiply by 60 mins per 1 hour:
(8 miles/30 mins) * (60 mins/1 hour) = 16 mph
.
This gives us our second equation (2):
m-c = 16
m = 16+c
.
Plug the above into equation 1 and solve for c:
m+c = 24
16+c+c = 24
16+2c = 24
2c = 8
c = 4 mph </span>
Answer:
6
Step-by-step explanation:
f(n+1) = f(n) -2
We know f(1) = 10
Let n=1
f(1+1) = f(1) -2
f(2) = 10-2 =8
We now know f(2)
Let n=2
f(2+1) = f(2)-2
f(3) = 8 -2=6
f(3) =6
I think this is what your doing am assuming . forgot but just put -3a+1a solve it and then do -1+2 and you got your anwser