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Olegator [25]
3 years ago
8

Two urns contain white balls and yellow balls. The first urn contains 3 white balls and 6 yellow balls and the second urn contai

ns 7 white balls and 3 yellow balls. A ball is drawn at random from each urn. What is the probability that both balls are white?
Mathematics
2 answers:
Otrada [13]3 years ago
5 0
The first is a 1/3 chance, the second is a 3/10 chance.  Multiply them both, you get 3/30, or 1/10 chance.
Alik [6]3 years ago
5 0
The first urn has 9 balls and 3 of them are white.
The probability of pulling out a white one is 3/9 = 1/3 .

The second urn has 10 balls and 7 of them are white.
The probability of pulling out a white one is 7/10.

The probability of BOTH things happening is  (1/3) · (7/10) = 7/30 = 0.2333...
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just olya [345]
I'm not completely sure but this is what I would do.
evaluate <span>(1/ 4)^x - 1 </span>as is. But change the (1 /2)^2x to (2/4)^2x. This way both fractions have the same denominator and in this sense, the same base. The 2/4 base still evaluates into 1/2 so nothing, mathematically, is being broken here.
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3 0
3 years ago
Find the percent change to the nearest whole percent. from 45 feet to 95 feet.
VMariaS [17]

Answer:

211%

Step-by-step explanation:

To calculate the percentage change between these two numbers we need to divide the end result from the initial starting point. Once we do this we need to multiply the product by 100 to get the percentage value.

95 / 45 = 2.11111

2.11111 * 100 = 211.11%

Finally, we can see that the percentage change from 45 ft. to 95 ft. is 211.11%. If we round this to the nearest whole percent it would be a change of 211%

8 0
3 years ago
A wall of a building is 22 inches wide ten inches is concrete 8 inches is brick and 4 inches is limestone. What fraction of the
alexandr1967 [171]

Answer:

fraction of the wall is limestone is 4/22

or 2/11 as a reduced fraction

Step-by-step explanation:

fraction of the wall is limestone is 4/22

the width is 22 in total

10 inches concrete = 10/22

8 inches brick : 8/22

4 inches limestone : 4/22

10/22+8/22+4/22=22/22=1

4 0
3 years ago
Please show work so i can understand if y = - 6 when x = - 14 find x when y = - 4
Nataliya [291]

x = -14, y = -6

x = ?, y = -4

We can cross multiply

-14/ -6 = ?/ -4

First, -4 x -14 = 56

Then 56/ -6 = -9.3

so if x= -14 and y= -6 then x= -9.3 when y = -4


6 0
3 years ago
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