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hjlf
2 years ago
15

Find the number, if 5/7 of it is 15

Mathematics
2 answers:
Karolina [17]2 years ago
7 0
Hey there! :D

Divide 15 by the numerator so we can find 1/7.

15/5= 3

3*7= 21

The number is 21. 

I hope this helps!
~kaikers
WARRIOR [948]2 years ago
3 0
5/7x=15
x=15×7/5=21
The number is 21
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Plz plz plz help me with this
erica [24]
This question wants you to find a common denominator for the fractions.
This means finding the LCM, least common multiple, for 21 and 9.
This can be done by listing the multiples for each number until they meet at a common one.

9:
9
18
27
36
45
54
63

21:
21
42
63

This means the LCM of 21 and 9 is 63.
So the lowest possible common denominator is 63.

21 • 3 = 63
So you have to multiply the numerator of 2/21 by 3 as well.
2 • 3 = 6
2/21 = 6/63

Now do the same for 1/9.
9 • 7 = 63
Multiply the numerator, 1, by 7.
1 • 7 = 7
1/9 = 7/63

So in the first blanks, you would put 6/63 for what 2/21 is equal to and 7/63 for what 1/9 is equal to.

7/63 is greater than 6/63.
7/63 > 6/63
That means 1/9 > 2/21
So 2/21 < 1/9 is the answer to the last blank.

Hope this helps!
6 0
3 years ago
Find all roots of the polynomial function F(x)=x^2-2x-24
liq [111]
f(x)=x^2-2x-24=x^2+4x-6x-24=x(x+4)-6(x+4)=\\\\=(x+4)(x-6)\\\\f(x)=0\ \ \ \Leftrightarrow\ \ \ (x+4)(x-6)=0\\\\.\ \ \ \ \ \ \ \ \ \ \  \ \ \Leftrightarrow\ \ \ x+4=0\ \ \ \ \ or\ \ \ \ \ x-6=0\\\\.\ \ \ \ \ \ \ \ \ \ \  \ \ \Leftrightarrow\ \ \ x=-4\ \ \ \ \ \ \ \ or\ \ \ \ \ x=6
4 0
3 years ago
Read 2 more answers
Find the slope of the following graph.<br><br> a) 1/3<br> b) 3<br> c) -3
Thepotemich [5.8K]
The slope is 3, you can find by picking 2 points and do the rise divided by run
3 0
2 years ago
Paul, Joey, and Matt have to catch the train back to school at 5:00pm. They want to tour the air and space museum for 1 hour and
Zigmanuir [339]

Answer:

2:25pm

Step-by-step explanation:

The time given is 5pm to catch the train back to school;

Amount of time for the tour  = 1hr 45min

                                               = 105min

Amount of time at gift shop  = 30min

Amount of time to save  = 20min

 Total time = 105min + 30min + 20min  = 155min

So;

Total time  = 2hr 35min

So;

        5pm - 2hr 35min  = 2:25pm

3 0
3 years ago
Consider a binary code with 5 bits (0 or 1) in each code word. An example of a code word is 01001. In each code word, a bit is z
AleksandrR [38]

Answer:

the probability that a code word contains exactly one zero is 0.0064 (0.64%)

Step-by-step explanation:

Since each bit is independent from the others , then the random variable X= number of 0 s in the code word follows a binomial distribution, where

p(X)= n!/((n-x)!*x!*p^x*(1-p)^(n-x)

where

n= number of independent bits=5

x= number of 0 s

p= probability that a bit is 0 = 0.8

then for x=1

p(1) = n*p*(1-p)^(n-1) = 5*0.8*0.2^4 = 0.0064 (0.64%)

therefore the probability that a code word contains exactly one zero is  0.0064 (0.64%)

3 0
3 years ago
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