1 red marble 4 blue marbles 3 green marbles probability of drawing 2 blue marbles

Mathematics

2 answers:

BaLLatris [955]3 years ago

5 0

Answer:

4/10

Step-by-step explanation:

love history [14]3 years ago

5 0

Answer:

3/14

Step-by-step explanation:

Assuming you draw one after the other without replacement, you have a 1/2 chance of drawing blue the first time, and after one is taken out, you have 7 left. In order to draw 2 blues you would have to have a blue the first time, so there would be 3 blue left. Multiplying the 2 probabilities gets 1/2*3/7= 3/14. Double check that though.

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The Perimeter of a Pentagon is 20.5 centimeters. Four sides of this pentagon have the same length, in centimeters, x, and the ot

RideAnS [48]

Answer:

$4.6\ \text{cm}$

Step-by-step explanation:

Perimeter of the pentagon = 20.5 cm

Length of 4 sides = $x$

Length of the other side = 2.1 cm

Perimeter of the pentagon will be

$x+x+x+x+2.1=20.5\\\Rightarrow 4x+2.1=20.5\\\Rightarrow 4x=20.5-2.1\\\Rightarrow 4x=18.4\\\Rightarrow x=\dfrac{18.4}{4}\\\Rightarrow x=4.6\ \text{cm}$