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Zarrin [17]
4 years ago
5

How is the equation for the four 9s

Mathematics
1 answer:
Veronika [31]4 years ago
7 0
I dont understand you have to be a little more acurate
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A northbound bus and a southbound bus are at a bus stop at the same time. The northbound bus returns to the bus stop every 20 mi
gulaghasi [49]

The question is essentially asking for the least common multiple of 20 and 25. There are several ways you can find the LCM. One easy way is to divide the product by the GCD (greatest common divisor).

GCD(20, 25) = 5 . . . . . see below for a way to find this, if you don't already know

LCM(20, 25) = 20×25/GCD(20, 25)

... = 500/5 = 100

The buses will be there together again after ...

... B. 100 minutes

_____

You can also look at the factors of the numbers:

... 20 = 2²×5

... 25 = 5²

The least common multiple must have factors that include all of these*, so must be ...

... 2²×5² = 100

___

* you can describe the LCM as the product of the unique factors to their highest powers. 20 has 2 raised to the 2nd power. 25 has 5 raised to the 2nd power, which is a higher power of 5 than is present in the factorization of 20. Hence the LCM must have 2² and 5² as factors.

_____

You can also look at the factorization of 20 and 25 to see that 5 is the only factor they have in common. That is the GCD, sometimes called the GCF (greatest common factor).

4 0
4 years ago
Read 2 more answers
What is the value of x? Show work.
ella [17]

Answer:

x=5

Step-by-step explanation:

This is because the inscribed angle of the circle or angle EFG is equal to the twice of the degree of the arc EG. Therefore, we can create this equation:

12+40=2(8x+10)

12+40=16x+20

20=4x

x=5

5 0
4 years ago
Khaled is preparing to paint his room. If it would take three workers 8 hours to apply two coats of
Tresset [83]

Answer:

20 minutes

Step-by-step explanation:

hope it helps u

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8 0
3 years ago
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A package of face mask was on sale for 1200 . This was 3/4 of the original price. What was the original price
-BARSIC- [3]

Answer:

900

Step-by-step explanation:

4 0
3 years ago
396 divided by 11. Step by step explanation
noname [10]

Answer: 36

Step-by-step explanation: using long division you take 11 divide into 398 so first, 11 goes into 39, 3 times

you have 6 left, so keep the 6 and drop down the other 6

next 11 goes into 66, 6 times making it 396/11= 36  

hope this helps

6 0
3 years ago
Read 2 more answers
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