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aleksandrvk [35]
3 years ago
8

a boat travels 36 miles downstream in 2 hours and returns upstream in 6 hours. find the speed of the current and the speed of th

e boat in still water
Mathematics
1 answer:
Tamiku [17]3 years ago
8 0

Answer:

3 miles per hour stream

Step-by-step explanation:


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David's last equation to solve is x/100+3/100=8/100. Write and solve an equivalent equation with easier numbers that would give
JulijaS [17]
\sf\dfrac{x}{100}+\dfrac{3}{100}=\dfrac{8}{100}

Subtract 3/100 to both sides:

\sf\dfrac{x}{100}=\dfrac{5}{100}

Cross multiply:

\sf100x=500

Divide 100 to both sides:

\sf~x=5

Or we could just multiply both sides of the equation by 100, to give us:

\sf~x+3=8

Subtract 3 to both sides:

\sf~x=5
3 0
3 years ago
Quadratic Word Problems
Anit [1.1K]
4. Let the numbers be x - 2, x, and x + 2, where x is an odd number.
2(x² - 4) - 4x = (x + 2)² + 21
2x² - 8 - 4x = x² + 4x + 4 + 21
2x² - 4x - 8 = x² + 4x + 25
x² - 8x - 33 = 0
(x - 11)(x + 3) = 0

x = 11, or -3
When x = 11, x - 2 = 9, x + 2 = 13

When x = -3, x - 2 = -5, x + 2 = -1

Explanation: You are on the right track. However, rather than having three unknown variables, try to reduce your working out to one unknown variable. Since you know they are consecutive odd numbers, you can simply let x be the middle term and the other two be + and - 2, provided x is an odd number.

That will reduce your variable issues, and helps as the first and third provide a difference of two squares, and this works out very nicely.

Q5: is essentially the same process. Let your variables be something in the form of one unknown variable, and you should be okay from there. Let me know if you're stuck.
5 0
3 years ago
A number is 9 more than another number. Twice the sum of the two numbers is 10. Find the two numbers.
Brrunno [24]

Step-by-step explanation:

the formula can be;

X+9x=10

10x=10X=10/10=1

X=1+9(1)=1+9=10 Answer

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3 years ago
Ram,raju and ravi can finish the running competition on circular track in 15 mins,20mins and 30mins respectively .If they start
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About 8:00 is when they will all have met up ram will have ran 4 laps raju will have ran 3 laps and ravi will have ran 2 laps
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3 years ago
Can you show me the step by step process for each question please
enot [183]

Answer:

Step-by-step explanation:

It shows when you press the answer button

6 0
2 years ago
Read 2 more answers
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