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Lorico [155]
3 years ago
7

Solve for x: 2/5=4/x

Mathematics
2 answers:
pickupchik [31]3 years ago
8 0
The answer is 10


Explanation: First you cross-multiply to get 2x=20 and then divide by 2 to get x=10
Sergeeva-Olga [200]3 years ago
6 0

9514 1404 393

Answer:

  x = 10

Step-by-step explanation:

Using your number sense, you recognize that a fraction equivalent to 2/5 that has 4 in the numerator is 4/10. This tells you x = 10.

__

The usual instructions for solving this algebraically are to "cross multiply", then divide by the coefficient of x.

  2/5 = 4/x . . . . given

  2x = 20 . . . . . multiply by 5x on both sides

  x = 10 . . . . . . . divide by 2

__

You can do the above two steps both at once: multiply by 5/2x.

  (2/5)(5/2x) = (4/x)(5/2x)

  x = 20/2 = 10

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Five times a number subtracted from 18 is triple the number find the number
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The number is 18

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AnnyKZ [126]

Answer:

B. Q' (1, 2)

Step-by-step explanation:

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4 0
2 years ago
Use a common denominator to write an equivelent fractions for each fraction.
sergejj [24]
Sorry for not giving you the calculation here -

5/12 and 2/9 have denominators divisible by only 3 right? Well The common denominator that can then change is 3 because that's the only number they have in common (except 1) 
8 0
3 years ago
A country's population in 1993 was 116 million.
labwork [276]

Answer:

124 million in 2007

Step-by-step explanation:

This is a proportion match question, we consider 121-116 to represent a 9 year change = 5 rate of change per 9 years. We need to find one year so we divide 5/9=0.55 per year growth. =2002- 2007= 0.55 million x 5 = 2.8million growth add 121 million = 121 =123.8 in 2007 = 124 million to nearest m.

7 0
3 years ago
Let R be the event that a randomly chosen person lives in the city of Raleigh. Let O be the event that a randomly chosen person
Anit [1.1K]

Answer:

P(O|R)

Step-by-step explanation:

The conditional probability notation of two events A and B can be written as either P(A|B) or P(B|A).

The '|' sign is read as 'given'. So, P(A|B) is read as the probability of event A given event B which implies that it is the probability that event A will occur given that event B has already occurred.

In the question,

Event R = Person lives in the city of Raleigh

Event O = Person is over 50 years old

The statement says, 'given that the person lives in Raleigh' which means that event R has already occurred and we need to find the probability of event O (the randomly chosen person is over 50 years old).

Hence, this statement can be given in conditional probability notation as

P(O|R)

7 0
3 years ago
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