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olasank [31]
3 years ago
14

The difference of a number times 4 and 9 equals 5

Mathematics
2 answers:
Over [174]3 years ago
8 0
<span>The difference of a number times 4 and 9 equals 5.  Let the number be n.
Then  4n - 9 = a number times 4
 The difference of a number times 4   AND     9  equals     5 comes out to be:

                                                      4n - 9 = 5

Add 9 to both sides:                       4n       = 14.  Then n = 14/4 = 7/2 (answer)

Note that 14 less 9 is 5.  This is one way in which you can check this result.

</span>
Nikitich [7]3 years ago
7 0
4y - 9 = 5
y is the unknown number
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A1,a2,a3....a30-each of these 30 sets has 5 elements.b1,b2,....bn-each of these n sets has 3 elements.union of a1,a2...a30=union
zzz [600]
 the number of elements in the union of the A sets is:5(30)−rAwhere r is the number of repeats.Likewise the number of elements in the B sets is:3n−rB
Each element in the union (in S) is repeated 10 times in A, which means if x was the real number of elements in A (not counting repeats) then 9 out of those 10 should be thrown away, or 9x.  Likewise on the B side, 8x of those elements should be thrown away. so now we have:150−9x=3n−8x⟺150−x=3n⟺50−x3=n
Now, to figure out what x is, we need to use the fact that the union of a group of sets contains every member of each set.  if every element in S is repeated 10 times, that means every element in the union of the A's is repeated 10 times.  This means that:150 /10=15is the number of elements in the the A's without repeats counted (same for the Bs as well).So now we have:50−15 /3=n⟺n=45
5 0
3 years ago
15×+2x can be written as?
Usimov [2.4K]

Answer:

15x + 2x can be written as 17x

8 0
3 years ago
Plzzzz helppppppppppppppp
GarryVolchara [31]

Answer:

ok

Step-by-step explanation:

5 0
2 years ago
I need help with this!!!
7nadin3 [17]

Answer:

6

Step-by-step explanation:

cancel out 5 by multiplying its by 5, what you do to one side you do to the other.   so you also multiply 12 by 5. and you should get 60

3 0
3 years ago
What is 3(x+2)-10=4x-6+x <br>​
Natalija [7]

Answer:

1=x or x=1

Step-by-step explanation:

3(x+2)-10=4x-6+x

distribute

3x+6-10=4x-6+x

combine like terms

3x-4=5x-6

subtract 3x from each side

-4=2x-6

add 6 to both sides

2=2x

divide by 2

1=x or x=1

8 0
3 years ago
Read 2 more answers
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