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MAVERICK [17]
3 years ago
7

There are 9 students in a class: 5 boys and 4 girls. If the teacher picks a group of 4 at random, what is the probability that e

veryone in the group is a boy?
Mathematics
1 answer:
sesenic [268]3 years ago
6 0

Answer:

The probability is 0.0397.

Step-by-step explanation:

There are 9 students in a class: 5 boys and 4 girls.

The teacher picks a group of 4 at random.

So, the probability that everyone in the group is a boy is given by :

(5/9)(4/8)(3/7)(2/6)=120/3024=0.0397

Or (5C4)/(9C4)=0.0397

Hence, the probability is 0.0397.

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What is slope-intercept form? <br> Why do we write equations using this form?
Brums [2.3K]
Slope intercept form is y=mx+b
m=slope
b=y-intercept

the slope is the rate of change of the graph, basically rise/run (change in y divided by change in x)

the y intercept is where the graph intercepts the y axis





we usually use this form because we can find the slope and find where it hits the y axis.
there are other forms that may be helpful later on, but this one is usually the easiest form to find from a graph
7 0
3 years ago
A cube is shown.<br><br> What is the surface area of the cube?
valkas [14]

1350 cm^2.  First, we must find the area of one side.  The formula for the area of a square is S^2 or S*S, so plugging in the value of the side we get 15*15=225.  So each side of the cube is 225 cm^2, so since there are 6 sides, we just multiply by 6 (225*6=1350).

4 0
3 years ago
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30 POINTS + BRAINLIEST TO FIRST CORRECT ANSWER!
Vinvika [58]

Answer:

The length will be multiplied by 2.

Step-by-step explanation:

By looking at the first and third ratio, we know that the no. of birck have been multiplied by 2 and the length has also been multiplied by 2 .

So when the number of bricks is multiplied by 2, the length is multiplied by 2

7 0
3 years ago
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Write an equation that could be used to find the value of x using the interior angles of ∆BDC, then solve it.
Alecsey [184]

9514 1404 393

Answer:

  x = 16

Step-by-step explanation:

Either or both of the right triangles can be used to find x. Or, triangle ABC could be used. All numbers are assumed to be degrees.

<u>Using ∆ABD</u>

  55 +90 +2x+3 = 180

  2x = 32 . . . . . . subtract 148

  x = 16

<u>Using ∆BCD</u>

  50 +90 +2x+8 = 180

  2x = 32 . . . . . . subtract 148

  x = 16

<u>Using ∆ABC</u>

  55 +(2x +3) +50 +(2x +8) = 180

  4x = 64 . . . . . . . subtract 116

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6 0
3 years ago
Is 42(x + 14y) equivalent to 42x - 56y
g100num [7]

Answer:

No its not

Step-by-step explanation:

When 42(x + 14y) is simplified:

42(x + 14y)

Expand and remove the brackets. Remember brackets mean to multiply.

42*x

42x

42*14y

588y

42x+588y

Therefore 42x-56 is NOT EQUIVALENT to 42(x + 14y) but is equivalent to 42+588y

3 0
3 years ago
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