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konstantin123 [22]
3 years ago
10

a bag has 9 green marbles and 6 red marble. half of the red marbles are made of plastic. a marbles selected at random from the b

ag. what is the probability it is a red plastic marble
Mathematics
1 answer:
Bingel [31]3 years ago
5 0
It will be 4.5 as its half.
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Determine which method works, substitution or elimination? 4x^2+3y^2=42x^2-6y^2=-3
GarryVolchara [31]

Given:

\begin{gathered} 4x^2+3y^2=4 \\  \\ 2x^2-6y^2=-3 \end{gathered}

Find the method .

Sol:

\begin{gathered} 4x^2+3y^2=4..............(1) \\  \\ 2x^2-6y^2=-3.............(2) \end{gathered}

2eq(1) + eq(2) then,

8x^2+6y^2=8

Then apply the elimination method.

\begin{gathered} 8x^2+6y^2=8 \\ 2x^2-6y^2=-3 \\ --------- \\ 10x^2=5 \\  \\ x^2=\frac{5}{10} \\  \\ x=\sqrt{\frac{1}{2}} \end{gathered}

3 0
1 year ago
How can I simplify this expression using only positive exponents ?
belka [17]
\dfrac{4}{2}\cdot\dfrac{r^3}{r^5}=2\cdot\dfrac{1}{r^2}\\\\=\dfrac{2}{r^2}
5 0
2 years ago
Help me with these questions circled
Vaselesa [24]
61.

40 ==> 100 %
x   ==> 15 %

15*40/100 = 6.

Therefore, merely 6 students received C grades.

62.

23 500 ==> 100%
x          ==> 42 %

42*23500/100 = 9870

Therefore 9870 people in the town are over 45 years of age.

You continue wth this method and you'll find for the 63, 64, 65.

In maths, you have to understand what you're doing dude ^^.

Whatever the answer for 64 and 65 are 

64.

21.50*20/100 = 4.3

65. 

250 ==> 100 %
45 ==> x %

x = 45*100/250 = 18 %

i will let you do the 63 alone, give me what you have found in the comments, i'll verify your answer.

Hope this helps !

Photon
7 0
3 years ago
In Mr. Sneed's classroom, there are 108 tiles and 9 lights. What is the ratio of lights to tiles in Mr. Sneed's classroom?
Dimas [21]
The ratio is 1:12

hope this helps
7 0
2 years ago
Read 2 more answers
What type of math is adding subtracting of positive and negative numbers
allochka39001 [22]
Hello There!

It is Arithmetic.

Hope This Helps You!
Good Luck :)
6 0
3 years ago
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