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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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Simplification <br>-4a+b+3c+3a-3b+c​
damaskus [11]

Answer:

-a+-2b+4c

Step-by-step explanation:

Combine like terms

-4a+ 3a= -a

b+ -3b= -2b

3c+ c= 4c

7 0
3 years ago
Give an example of a system of linear equations that can be solved by first adding the equations to eliminate one variable.
telo118 [61]

f ( 7 ) = 2.4 ft

Step-by-step explanation:

Solution:-

- This is modeled using a geometric sequence function with initial height from which ball is dropped hi = 18 feet, and a decrease in height by 25% after each successive bounce :

                      f ( x ) = 18 (0.75)^x

Where,   x e [ 0 , ∞ ) : The number of bounces.

             f (x) : The maximum height after xth bounce.

- The maximum height reached by the ball after its 7th bounce. So, x = 7:

                       f ( 7 ) = 18 (0.75)^7

                       f ( 7 ) = 2.4027 ft

- To the nearest tenth:

                     f ( 7 ) = 2.4 ft

5 0
3 years ago
Divide 2/3 by 8/15. Simplify your answer
masha68 [24]

Answer:

5/4

Step-by-step explanation:  

(2/3)/(8/15)

= (2/3)(15/8)

= (2*15)/(3*8)

= 30/24

= 5/4

7 0
1 year ago
Read 2 more answers
Can you Solve this please?
julia-pushkina [17]
Answer is -5
-6y + 2 = -2(4y + 4)       factor first
-6y + 2 = -8y - 8            put y on one side of the equation
2y + 2 = -8                    isolate y
2y = -10
y = -10/2
y = 5
5 0
3 years ago
If you add two fractions that are both greater than 1/2 what must be true about the sum
skelet666 [1.2K]

Answer:

The sum will be greater than 1

5 0
3 years ago
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