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melisa1 [442]
3 years ago
9

What value of x makes this proportion true? 3/x = 15/40 A. 5 B. 28 C. 8 D. 105

Mathematics
2 answers:
Archy [21]3 years ago
5 0

Answer:

here the value of X should be 8 to make this proportion true

3/8=15/40

by cross multiplying

15*8=40*3

120=120

therefore the option C is correct

marysya [2.9K]3 years ago
3 0

Answer:

the answer is option C

hope it helps you

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10. Find the value of x in the equation 2(x - 3) + 5x = 5(2x + 6).
RoseWind [281]

Option A

<u>Answer: </u>

The value of x in the equation 2(x - 3) + 5x = 5(2x + 6) is -12

<u>Solution: </u>

From question given that

2(x - 3) + 5x = 5(2x + 6)

Open the brackets,

2x – 6 + 5x = 10x + 30

Rewrite the above equation,

2x + 5x – 6 = 10x + 30

On simplifying the above equation, we get

7x – 6 = 10x + 30

Now adding 6 on both sides,

7x – 6 + 6 =10x + 30 + 6

7x = 10x + 36

On subtracting 10x on both sides,

7x - 10x = 10x + 36 - 10x

-3x = 36

On dividing -3 on both sides,

x = -12

Hence on simplifying 2(x - 3) + 5x = 5(2x + 6) we get value of x is -12. Hence Option (A) is correct.

7 0
4 years ago
How do I do 86+y=99 the picture that is attached to this is how the teacher wants us to do it but I don’t understand help please
Anni [7]

Okay, take for example:

1+2=3 is the same as 1=3-2

See how we changed the place of the 2. We can do that as long we change + to - and vica versa.

Let's see your example:

6+y=-8

We move the 6 on the other side of the expression with the opposite sign (it is a rule) and we get:

y=-8-6

y=-14

The answer to your question is

86+y=99

y=99-86

y=13

8 0
3 years ago
What is the least common multiple for 6 and 21?
Crank
3 is the least common multiple for 6 and 21
5 0
3 years ago
If the total number of faces on a triangular pyramid is subtracted from the number of faces on a cube, what is the result?
Volgvan

Answer:

So you have 6 faces on a square, correct? And then you have 5 faces on a pyramid (including bottom). S, in how I am seeing it, you divide 6 by 5 to get 1.2. If this is incorrect I am sorry but that is what I see is correct.

Step-by-step explanation:

6/5=1.2

3 0
4 years ago
Read 2 more answers
Which expression is equivalent to log2 9x^3?
marishachu [46]

Answer:

Option 1 - \log_{2}(9 {x}^{3} )=\log_{2}(9 ) +3 \log_{2}( {x}  ) - log Subscript 2 Baseline 9 + 3 log Subscript 2 Baseline x

Step-by-step explanation:

Given : Expression \log_2(9x^3)

To find : Which expression is equivalent to given expression ?

Solution :

Expression \log_2(9x^3)

Applying logarithmic property, \log_{a}( MN )  = \log_{a}( M) + \log_{a}( N )

\log_{2}(9 {x}^{3} )  = \log_{2}(9 )  +  \log_{2}( {x}^{3}  )

Using property, \log_{a}(  { M}^{n} ) =n  \log_{a}(  { M})

\log_{2}(9 {x}^{3} )=\log_{2}(9 ) +3 \log_{2}( {x}  )

i.e. log Subscript 2 Baseline 9 + 3 log Subscript 2 Baseline x

Therefore, option 1 is correct.

8 0
3 years ago
Read 2 more answers
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