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Colt1911 [192]
2 years ago
6

In a group of 21 students, 8 students take Art courses, 7 students take Music courses. Two students take both courses. A student

is chosen randomly from this group. What is the probability that the student takes either Art or Music courses? 57
Mathematics
1 answer:
Blababa [14]2 years ago
3 0
Since two people take both courses, we can subtract two from 7, 8, and 21, giving us 5, 6, and 19.

Add 5 and 6 together to get 11. Since eleven students are in those two groups, we can answer this. The answer will be 11/19.
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Quadratic factorisation Question, help please.
luda_lava [24]
3x^2 + 5x + 2 

a = 3 , b = 5 , c = 2 

Start by mulitplying a*c = 3 * 2 = 6

Now find two number that multiply to 6 and add up to b or 5 

We could use 2 and 3 because ....

   
3 + 2 = 5 
   3 * 2 = 6

Now you rewrite....

3x^2 + 3x + 2x + 2 

Now pull out common factors...

3x ( x + 1 )  + 2 ( x + 1)

The factors of this expression is ( 3x + 2 ) ( x + 1) 
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3 years ago
I ONLY HAVE A LITTLE TIME ANS NEED HELP!!!!! can someone explain this to me
denpristay [2]

Answer:

x = 92

Step-by-step explanation:

\frac{x}{46} =\frac{78}{39}

I did big side over small side, proportions.

Cross Multiply.

39x = 3,588

divide by 39x

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4 0
3 years ago
Read 2 more answers
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BabaBlast [244]

Answer:

The first term of the sequence is -120.

Step-by-step explanation:

The formula for the "nth" term of a geometric sequence is shown below:

an = a0*r^(n-1)

Where an is the nth term, r is the ratio and n is the position of the term on the sequence. For this problem we want to find what is the initial term, a0, so we will isolate it in the formula as shown below:

a0*r^(n-1) = an

a0 = an/[r^(n-1)]

We then apply the data given to us

a0 = 31.45728/[-0.8^(7-1)]

a0 = 31.45728/[-0.8^6] =31.45728 /-0.262144= -120

The first term of the sequence is -120.

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3 years ago
A grocery store has 120 bottles of spring
notka56 [123]

Question:

A grocery store has 120 bottles of spring water in stock.  The store orders bottles of spring water in cases of 24.  The store wants to order enough cases of spring water so it has more than 500 bottles in stock.  Which inequality best models this situation?

A.  24x + 120 > 500

B.  24x - 120 > 500

C.  24x + 500 > 120

D.  24(x+120) > 500

Answer:

Option  A.  24x + 120 > 500  is the inequality that best models this situation.

Step-by-step explanation:

The Number of bottles of spring  water in the stock = 120

Each case of the spring water bottles contains 24 bottles

The store wants  to order enough cases of spring water so  that it has over 500 bottles in stock.

So there are already 120 bottles in stock .

The store will order

24x +120  > 500

where x  is the number of spring water bottle cases

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Step-by-step explanation:

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