Answer:
Solving the equation
for variable n we get 
Step-by-step explanation:
We need to solve the equation
for variable n
Solving:

Subtract both sides by 6p

Switch sides of equality

Divide both sides by 3

So, solving the equation
for variable n we get 
Answer: 44 dollars
Step-by-step explanation:
Answer:
2 km/h
Step-by-step explanation:
Let x represent the speed of the river current, t₁ be the time spent rowing against the current and t₂ be the time spent rowing with the current.
Since the speed of the still water = 20 km/h.
The speed of rowing against the current = (20 - x)
The speed of rowing with the current = (20 + x)
We know that velocity = distance / time. Hence time = distance / velocity
t₁ = 36 / (20 - x)
t₂ = 22 / (20 + x)
but t₁ + t₂ = 3 hours
Therefore:
3 = 36 / (20 - x) + 22 / (20 + x)
multiply through by 400 - x²
3(400 - x²) = 36(20 + x) + 22(20 - x)
1200 - 3x² = 720 + 36x + 440 - 22x
3x² + 14x -40 = 0
This gives x = -6.7 or x = 2
x cannot be negative therefore x = 2 km/h
The speed of the river current is 2 km/h
Answer:
The answer to your question is x = 2
Step-by-step explanation:
To solve this problem just count the number of x and the number of numbers ONE on each side of the equation.
- There are three "x"
- There are 4 number one on the left side equation
- There are 10 number one one the right side of the equation
Equation
3x + 4 = 10
Solve for x
3x = 10 - 4
3x = 6
x = 6/3
x = 2
Answer:
60% =
75% = 
84% = 
65% =
Step-by-step explanation:
60% =
because 3 ÷ 5 = 0.6
75% =
because 3 ÷ 4 = 0.75
84% =
because 21 ÷ 25 = 0.84
65% =
because 13 ÷ 20 = 0.65