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Lorico [155]
3 years ago
6

A jar contains only black and white marbles. When one marble is drawn at random, the probability that it is white is 1/3. After

20 black marbles were added to the jar, the probability of drawing a white was 1/5. How many marbles were in the jar originally?
Mathematics
1 answer:
KonstantinChe [14]3 years ago
6 0

there are 30 marbles in the jar originally

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Can someone help me please
Tasya [4]

Answer:

  Square

Step-by-step explanation:

The length of AB is (a+b)-a = b. The length of BC is b-0 = b. So, adjacent sides are the same length. AB has a constant y-value, so is horizontal. BC has a constant x-value, so is vertical.

A figure with horizontal and vertical sides of the same length is a square.

7 0
3 years ago
Tennis balls with a diameter of 2.5 in.are sold in cans of three. The can is a cylinder. What is the volume of the space in the
Alexxandr [17]

Using 3.14 for PI.

The radius of a ball and the can is half the diameter = 1.25

The height of the can is the height of 3 diameters = 7.5

Volume of one tennis ball:

4/3 x PI x 1.25^3 = 8.18 cubic inches.

Volume of 3 tennis balls: 3 x 8.18 = 24.54 cubic inches.

Volume of can:

PI x 1.25^2 x 7.5 = 36.80 cubic inches.

Space = 36.80 - 24.54 = 12.26 cubic inches.

3 0
3 years ago
Answer now please.ASAP
ruslelena [56]

Answer:

12.56

Step-by-step explanation:

8 times 3.14 is 25.12. Then 4 times 3.14 is 12.56. Finally, you take 25.12 - 12.56 and the answer is 12.56.

7 0
2 years ago
Find the distance between each pair of integers. 9 and –1
Norma-Jean [14]

Answer: the distance is 10

Step-by-step explanation: its 10 cause like if you draw a number line and label it and then go backwards till you get to -1 it  will be 10

3 0
3 years ago
What fraction is equivalent to 3/10 and has a denominator of 100
rosijanka [135]

Answer:

30/100

Step-by-step explanation:

This should be relatively easy since if the denominator is 100 then x/100 has to = 3/10

Since the denominator 10 has to be 100, you multiply by 10.

3 x 10 = 30

7 0
3 years ago
Read 2 more answers
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