B and c are the speeds of the boat (in still water) and the current.
Traveling with the current, the boat goes b+c km per hour.
1 hour * (b+c km)/hour = 15 km
b+c = 15
Traveling against the current, the boat goes b-c km per hour.
3 hours * (b-c km)/hour = 15
b-c = 5
Add the two equations
b = 10 km per hour
I like changing things into decimals, so 7.25-2.75. For the moment, pretend the decimal isn’t there and the equation is 725-275. That equals 450. Now we put the decimal back, so since it is subtraction you keep the decimal in the same place (two spots away from the end). So the answer is 4.5.
Let x = -1
y = 2(-1) + 3
y = -2 + 3
y = 1
D is the answer.
Answer:
The answer would be 19
Step-by-step explanation:
You plug in the x and y values, and it looks like this
2(4)^2/8+5(3)
Simplify
2(16)/8+15
32/8+15
4+15
--->19<---
