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AlexFokin [52]
3 years ago
12

Solve 2/x+12/x=7 A. 2 B.-2 C. 28 D.-28

Mathematics
1 answer:
Juliette [100K]3 years ago
3 0

\frac{2}{x}+\frac{12}{x}=7\\\frac{2+12}{x}=7\\\frac{14}{x}=7\\14=7x\\\frac{14}{7}=x\\x=\frac{14}{7}\\x=2

The answer is A. 2

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Two cards are randomly selected from an ordinary playing deck.
Anna007 [38]

Answer:

The required probability is 0.048

Step-by-step explanation:

Consider the provided information.

Out of 52 card we need to select only 2.

Therefore the sample space is: ^{52}C_2=1326

One card is Ace. The number of Ace are 4 and we need to select one of them.

This can be written as: ^4C_1=4

The second card can be Ten or a Jack or a Queen or a King.

There are 4 Ten, 4 jack, 4 Queen, and 4 king in a deck and we need to select only 1 out of them.

So we can say that we need to select 1 card out of 16.

This can be written as: ^{16}C_1=16

Thus, the probability that one of the cards is an ace and the other one is either a ten, a jack, a queen or a king is:

P=\frac{16\times4}{1326}\approx0.048

Hence, the required probability is 0.048

3 0
4 years ago
One inlet pipe can fill an empty pool in 12 hours, and a drain can empty the pool in 20 hours. How long will it take the pipe to
Andrei [34K]
<span>30 hours For this problem, going to assume that the actual flow rate for both pipes is constant for the entire duration of either filling or emptying the pool. The pipe to fill the pool I'll consider to have a value of 1/12 while the drain that empties the pool will have a value of 1/20. With those values, the equation that expresses how many hour it will take to fill the pool while the drain is open becomes: X(1/12 - 1/20) = 1 Now solve for X X(5/60 - 3/60) = 1 X(2/60) = 1 X(1/30) = 1 X/30 = 1 X = 30 To check the answer, let's see how much water would have been added over 30 hours. 30/12 = 2.5 So 2 and a half pools worth of water would have been added. Now how much would be removed? 30/20 = 1.5 And 1 and half pools worth would have been removed. So the amount left in the pool is 2.5 - 1.5 = 1 And that's exactly the amount needed.</span>
6 0
3 years ago
Someone help me with this pleaseeee!!!! I need help ASAP pleasee!!!
tangare [24]
It’s 65.41 rounded to the nearest hundredth
4 0
3 years ago
Surface area of a trash can plz show work
ollegr [7]

Answer:

Step-by-step explanation:

So first we need to find the area of the trash can so here is the math:

The formula:

A=LxW

Replace the letters with numbers:

8=2x4

So the area is 8 feet now we can create an equation to solve how much money it would take to make the trash can:

8x0.79=$6.32

It would take $6.32 to make the trash can

6 0
3 years ago
True or false? The hypotenuse is the shortest side of a right angled triangle
kicyunya [14]

Answer:

false

Step-by-step explanation:

its the longest side opposite the 90 degree angle

5 0
3 years ago
Read 2 more answers
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