Boat takes 3 hours to go 6 miles upstream. it can go 18 miles downstream in the same time. find the rate of the current and the rate of the boat in still water

Answers

Answer 1
Find the MPH of the boat when it goes upstream... 3h / 6m = 1h / 2m
So, 2mph
Speed of the boat - current = 2mph - > x - y = 2
Find the MPH of the boat going downstream... 3h / 18m = 1h / 6m
So, 6mph
x + y = 6
We now have a system of equation, let's solve it!

x - y = 2 -> x = y + 2
x + y = 6  - >  (y + 2) + y = 6  ->  2y + 2 = 6   ->   2y = 4    ->   y = 2
This is the speed of the current!
Subtitute y = 2 in the first equation:
x - 2 = 2
x = 4
This is the speed of the boat
Rate of the current = 2mph
Rate of the boat in still water = 4mph


Related Questions

The number 3.141595... is called what?

Answers

the answer you are looking for is Pi
3.141595... is known as Pi.

At city high school,the sophomore class has 60 more students than the freshman class.the junior class has 50 fewer students than twice the students in the freshman class.the senior class is three times as large as the freshman class.if there are a total of 1,424 students at the city high school,how many students are in the freshman class?

Answers

S=f+60
J=Fx2-50
Senior=fx3

(f)+(f+60)+(fx2-50)+(fx3)=1424 (Parenthesis first)
f+f+60+2f-50+3f=1424 (rewrite)
2f+60+2f-50+3f=1424 (combine like variables)
7f+10=1424 (rewrite)
7f=1414 (isolate variable (take away 10 from each side))
1414/7
202=freshman
Answer:

The number of students in the freshman class are:

                                 202

Step-by-step explanation:

Let the number of students in Freshman class = x

The sophomore class has 60 more students than the freshman class.

This means that the number of students in sophomore class = x+60

The junior class has 50 fewer students than twice the students in the freshman class.

This means that the number of students in junior class= 2x-50

The senior class is three times as large as the freshman class.

This means that the number of students in senior class are: 3x

There are a total of 1,424 students at the city high school.

This means that:

[tex]x+x+60+2x-50+3x=1424\\\\x+x+2x+3x+60-50=1424\\\\7x+10=1424\\\\7x=1424-10\\\\7x=1414\\\\x=\dfrac{1414}{7}\\\\x=202[/tex]

A coin is flipped five times find the number of possible sets of heads and tails that have 0 heads

Answers

The number of possible sets with 0 heads when flipping a coin five times is 1, represented by five consecutive tails (TTTTT).

When flipping a coin five times, the number of possible sets that have 0 heads (meaning all tails) is just one. This single microstate is TTTTT.

The reason for this is that each coin flip is an independent event with two possible outcomes: heads (H) or tails (T). When we are only concerned with the total head and tail count and not the order in which they appear, the only set with 0 heads is the set where every coin lands on tails.

Algebra Vocabulary Crossword help ?!

1. a relation described in word format? (17 letter)

9. a way to name a function identifying its input?
(16 letter)

Answers

1. a relation described in word format (17 letter) is  "is direct variation"

9.  a way to name a function identifying its input (16 letter) is "f of x equals x square"
Final answer:

The student is looking for the terms 'Verbal Description' and 'Function Notation' for their Algebra Vocabulary Crossword. These refer to a relation described in word format and a way to name a function identifying its input respectively.

Explanation:

Based on the number of letters you've indicated, it looks like you're looking for two vocabulary items in the field of Algebra.

First, a relation described in a word format is typically called a Verbal Description, which has 17 letters.

Second, a way to name a function identifying its input is called Function Notation, which has 16 letters.

In Algebra, Verbal Description is when you describe a mathematical relationship using words. For example, 'the sum of a number and three is seven.' This could be translated to the equation x+3=7.

Function Notation, on the other hand, is a way to name a function that is dependent on one or more inputs. For example, f(x) = x^2 is function notation, since the output 'f(x)' is dependent on the input 'x'.

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Simplify the Expression.

-1/8 - 2/7 =

A. -1/8
B. 23/56
C. -23/56
D. 1/5

Answers

Since one number is negative and one is not and it is asking us to subtract, we have to make the second fraction a negative and add them together. 
We can multiply 7 and 8 to get a common denominator and so we now have -7/56 + -16/56. 
We can now add the negatives together to get -23/56 as your final answer.


If the ratio between the radii of the two spheres is 3 5 what is the ratio of their volumes

Answers

3^3 / 5^3 = 27 / 125

Answer:


The answer is 27:125

Cho welcome


If an exterior angle of a regular polygon measures 40°, how many sides does the polygon have?

Answers

the sum of all exterior angles is always 360 degrees.
360/40=9 sides

the polygon has 9 sides.

What is 39ft/min to yd/s?
Please explain using dimensional analysis.

Answers

Dimensional analysis simply means to arrange the units in the problem in a such a way that they cancel each other out and you're left with the units you need in the answer. We do this by using conversion ratios arranged like fractions, then multiplying across left to right.

In your problem, we're given ft/min and need to convert to yd/s. Start with feet and convert to yards for the numerator, then convert minutes to seconds for the denominator: (pretend the parentheses encompass the entire fractions - limitations of the answer box)
39 feet    x ( 1 yard )  x   (1 min)
1 min           3 feet           60 sec

Notice that feet cancel, and minutes cancel. We're left with yards in the numerator and seconds in the denominator.
Multiplying the numbers, we get 39/180, which simplifies to 0.217.
The final answer is ~0.22 yd/sec.

Which equation below represents a vertical line? y = x + 0, y = x – 0, y = 4, x = 4

Answers

a vertical line is represented by x = a number
so ur vertical line is : x = 4 <==

** and just so u know, a horizontal line is represented by y = a number.
[tex]x=4[/tex] is the answer
hope this has helped you

Michael has 4 lots of land to sell. He sells two of them at a loss of $1,200 each and sells the other two at a profit of $1,400 each. How much money does he make on his investment?

Answers

He makes $400 as an investment because 1400*2= 2800

1200*2= 2400

Subtract the two number 2800-2400= 400
Final answer:

Michael makes a total of $400 from his land investment after calculating the total losses and gains from the lands sold.

Explanation:

In order to find out the total money that Michael has made from his land investment, you need to calculate the losses and the gains individually. Michael sells two of his lands at a loss of $1,200 each, hence his total loss is 2 * $1,200 = $2,400. On the other hand, he sells the other two lands at a profit of $1,400 each, hence his total profit is 2 * $1,400 = $2,800.

To get the total money that he made on his investment, you subtract the total loss from the total profit. That is $2,800 (total profit) - $2,400 (total loss) = $400. Hence, Michael makes $400 on his investment.

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If y = 44 when x = –264, what is y when x = –486

Answers

Final answer:

The value of 'y' when x equals -486 using the same ratio (1:6) as given in the original input is -81.

Explanation:

To solve this problem, we're given a ratio of y to x (1:6) when x is -264 and y is 44. This ratio implies that y is one-sixth of x. Utilizing this information, we can determine y for a different x value (-486). By maintaining the 1:6 ratio, we divide -486 by 6, resulting in -81. Therefore, when x is -486, y equals -81. This solution stems from understanding the proportional relationship between y and x, allowing us to calculate y for any given x value based on the established ratio. In this case, the ratio of 1:6 guides the computation, ensuring the accurate determination of y as -81 when x is -486.

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300 yards / 1 minute find unit rate feet per wonds

Answers

132 ft / sec. I believe this is the answer.

The number of boys in the chess club is 4 more than twice the number of girls.there are 38 boys in the chess club. How many girls are in the club?

Answers

There are 17 girls in the club. I subtracted 4 from 38, which gave me 34. Then I divided that by 2. 

Ivan is saving money to buy a game. so far he has saved $30 , which is two-thirds of the total cost of the game. how much does the game cost?

Answers

Let y be the $ of the game
(2/3)y=30
2y=90
y=45
The game costs $45.

Answer:

45 :)

Step-by-step explanation:

How many terms are in the expression a3 + 3a2b - 4ab - 11b + 7?

7
4
5
6

Answers

There are 4 terms
Hope this helps

the answer is 5

1: a^3

2: 3a^2b

3: 4ab

4: 11b

5: 7

anything seporated by a + or - is a term

Neil and Jean each choose a number at random from the set 1,2,3,4,5,6,7,9,10 their numbers are allowed to be the same. What is the probability that the product of those two numbers is even?

Answers

Final answer:

The probability that the product of the numbers selected by Neil and Jean is even is approximately 0.8889.

Explanation:

To answer your question, let's first classify the numbers from the given set 1,2,3,4,5,6,7,9,10 into two categories: even numbers (2, 4, 6, 10) and odd numbers (1, 3, 5, 7, 9). Each of the people, Neil and Jean, can pick any number independently. Hence we have two scenarios which result in the product being even - either both pick even numbers or at least one of them picks even.

The probability of both picking an even number is (4/9)*(4/9) = 16/81. Also, there is no constraint on the second scenario, so, total probabilities = 1. Hence, the probability of at least one picking an even is 1 - probability(both picking odd) = 1 - (5/9)*(5/9) = 1 - 25/81 = 56/81.

Therefore, the total probability that the product of the numbers selected by Neil and Jean is even is the sum of the above two probabilities i.e., 16/81 + 56/81 = 72/81 = 0.8889 (approx).

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Simplify the expression. 23 · 16 + 24 ÷ 4

A. 80

B. 38

C. 134

Answers

38 is most likley the answer am i right?!

Final answer:

To simplify the expression 23 · 16 + 24 ÷ 4, we first perform the multiplication and division according to PEMDAS, resulting in 368 + 6, and then add those results to get the final answer, 374.

Explanation:

To simplify the expression 23 · 16 + 24 ÷ 4, we need to follow the order of operations, which is often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, Addition and Subtraction from left to right).

First calculate the multiplication: 23 × 16 = 368.

Then, the division: 24 ÷ 4 = 6.

Finally, add the two results together: 368 + 6 = 374.

Therefore, the simplified expression equals 374.

(−2+2i)⋅(5+5i)
Can you help me simplify

Answers

(−2+2i)⋅(5+5i)
FOIL
-10-10i+10i+10i²=-10+10i² this is the simplify answer
If you want the complete answer is 
-10+10(-1)=-10-10=-20

Please can you help me

Answers

Answer:

  5 : 1

Step-by-step explanation:

From your second-grade memorization of multiplication tables, you recognize that 15 = 3×5, so you know 3 is a factor of both numbers in the ratio. To reduce the ratio to simplest form, you divide out all common factors:

  15 : 3 = (15/3) : (3/3) = 5 : 1

Two ants walk on a line in a random fashion. they begin 10cm apart. at each time step, each ant has a probability of 1/2 to move 1cm to the left, and probability 1/2 to move 1cm to the right. what is the probability that after 7 time steps, the ants have met one another (i.e., passed through the same point)?

Answers

121/16384 exactly, or approximately 0.739% Each time step, there are 4 possibilities that will happen. They are a1 a2 -1 -1 = Ants move to left, distance remains the same. -1 1 = Ants move away from each other, distance = distance + 2 1 -1 = Ants move to each other, distance = distance - 2 1 1 = Ants move to right, distance remains the same. For the rest of the discussion, I'll call the possible moves advance, retreat, and idle (and there's 2 ways idle can happen). If you consider the possible moves, the ants can reach each other only at time steps 5, 6, or 7. Let's consider each of those values separately. 5 time steps. This can only happen if all 5 moves are advances. And after they reach each other we don't care what happens for the remaining 2 steps so there is 1 * 4 * 4 = 16 possible sequences where the ant reach each other on the 5th step. 6 time steps. The only way this can happen is with 5 advances and 1 idle, with the idle happening during one of the 1st 5 steps. So there's 5 ways for that to happen. And since there's 2 different actions that are an idle, we multiply that 5 by 2 to get 10. And finally, we don't care what happens with the 7th step, so we multiply once again by 4, getting 40. 7 time steps. This can happen 2 ways. If the 1st 6 steps are 4 advances and 2 idles with the idles happening during any step, then we have 6!/(2!4!) = 15 different arrangements. Since we have 2 different types of idles, we need to multiply by 2 for each idle, so we have 15 * 2 * 2 = 60 possible ways to do this. It can also happen if during the 1st 6 steps we have 5 advances and 1 retreat with the retreat happening during one of the 1st 5 moves. So there's 5 ways to get the ants to meet if the sequence has a retreat. So with a sequence of 7 time steps, there are 16 + 40 + 60 + 5 = 121 possible sequences that have the ants at the same point at the same time. Now since there are 4 possibilities for each step, there are 4^7 = 16384 possible sequences that can be done. So the probability of the 2 ants meeting each other is 121/16384 = 0.007385254 = 0.7385254%

WHY is -2 3 8l9 1,476 -6.01 all rational numbers . have a separate explanation for each number

Answers

There really doesn't need to be a separate explanation for each number because 1 explanation would explain everyone of them.

All of these numbers are rational because a rational number is, or can be, turned into a fraction.

-2 = -2/1
3 = 3/1
819 = 819/1
1,476 = 1,476/1
-6.01 = -6 1/100 = -601/100

One out of two people entering the grocery store purchase soda. how many people out of 20 purchase soda?

Answers

Answer:  "10" .
______________________
1/2 = x/20 

(1*10) = (2*10) = 10/20 .

Note: 2*10 = 20.

1/2 = 10/20 .

10/20 = ?  ;  Cancel out the zeros to get:  "1/2" ;    "10/20 = 1/2" .

i'm working at a distribution place and need help i'm supposed to be averaging 1000 units every hours if i do 4800 in a shift i'm 48 minutes behind schedule how many units per a hour am i averaging

Answers

Expected throughput is
1000 units/h

Therefore the expected time for 4800 units is
(4800 units)/(1000 units/h) = 4.8 hours = 288 minutes

Because the worker is 48 minutes behind schedule, the actual time is
288 + 48 = 336 minutes = 5.6 hours

The actual average throughput is
(4800 units)/(5. h) = 857 units per hour.

Answer:  857 units per hour.

PLEASE ANSWER FAST!
Which statement best describes why the sale price is a function of the original price?
A:As the original price increases, the sale price also increases.
B:The sale price is always less than the original price.
C:For every original price, there is exactly one sale price.
D:The sales price is never less than zero.

Answers

Answer:

I think B,not sure

Step-by-step explanation:

Answer:

B

Step-by-step explanation:

Got it right

Cups are sold 5 to a package and plates are sold 10 to a package. If you want to have the same number of each item for the party, what is the least number of packages of each you need to buy?

Answers

i think the answer would be 
20, the LCM 
(least common multiple) :)

1 package of plates = 10 plates  and 2 package of cups = 10 cups

 so 3 packages is least amount


If a line is perpendicular to a line segment, what angle do they form at their intersection

Answers

If a line is perpendicular to a line segment, then they will form a right angle.
90 degree will be the answer cause its a right angle.

Is it true that |3-8| and |3+8|

Answers

No, it is not true. If you solve them, the first one is 5, while the second one is 11.

To determine if |3-8| is equal to |3+8|, we calculate the absolute values: |3-8|=5 and |3+8|=11. Since 5 is not equal to 11, the statement is false.

To solve the given problem, we need to understand the properties of absolute values. Absolute value measures the distance of a number from zero on the number line, regardless of direction.

First, calculate the absolute value of each expression: |3-8| and |3+8|.For |3-8|:

       3 - 8 = -5, and the absolute value of -5 is 5. Therefore, |3-8| = 5.

For |3+8|:

        3 + 8 = 11, and the absolute value of 11 is 11. Therefore, |3+8| = 11.

In conclusion, it is not true that |3-8| equals |3+8|, as |3-8| = 5 and |3+8| = 11.

here is the full question-Is it true that |3-8| and |3+8| are equal?

Please help me .......

Answers

Answer:

[tex]9b+10u > 1,000[/tex]

15 points!! The power P (measures in horsepower, hp) needed to propel a boat is directly proportional to the cube of the speed s. A 73-hp engine is needed to propel a certain boat at 10 knots. Find the power needed to drive the boat at 19 knots. (Round your answer to the nearest whole number.)

Answers

The power Needed to drive the boat at 19 knots is 24

The commission of selling each iPhone is $30 and the commission of selling each iPad is $20. If you one day sold 4 more iPhones than iPads and earned a total commission of $520, how many iPhones and iPads did you sell respectively?

Answers

lets assume number of iphones sold = a number of ipads sold = b i sold 4 iphones more than ipad that becomes a = b+4 then the equation of total commission becomes 30a+20b = 520 substituting a =b+4 in the above equation 30(b+4)+20b = 520 30b+120+20b = 520 50b =520-120 50b = 400 b = 400/50 b=8 number of iphones i sold = a = b+4 = 8+4 = 12 number of ipads i sold = 8 so i sold 12 iphones and 8 ipads to earn the commission of $520

By solving the system of equations which includes the total commission and difference in quantity of iPhones and iPads sold, we determine that the salesperson sold 8 iPads and 12 iPhones.

The student is tasked with solving a system of linear equations to determine how many iPhones and iPads were sold based on the commission earned. Let's define the number of iPads sold as x and the number of iPhones as x + 4.

The total commission for iPhones is $30 per iPhone and the total commission for iPads is $20 per iPad. The total commission earned from selling these products is $520.

We can set up two equations based on the given information:

Commission from iPhones: 30(x + 4)

Commission from iPads: 20x

Total Commission: 30(x + 4) + 20x = 520

By solving the equation 30(x + 4) + 20x = 520, we find:

30x + 120 + 20x = 520

50x + 120 = 520

50x = 400

x = 8

So, the number of iPads sold is 8. Since the number of iPhones sold is 4 more than iPads, we have:

Number of iPhones sold = x + 4 = 8 + 4

Number of iPhones sold = 12

Therefore, the salesperson sold 8 iPads and 12 iPhones respectively.

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