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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?

1 answer:

KonstantinChe [14]3 years ago

6 0

there are 30 marbles in the jar originally

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Which expression is equivalent to 36^-1/2

inn [45]

ANSWER

$( {36})^{ (- \frac{1}{2}) } = \frac{1}{6}$

EXPLANATION

The given expression is

${36}^{( - \frac{1}{2} )}$
This is having a negative index. We must first of all change to a positive index.

Recall that,

${a}^{ - m} = \frac{1}{ {a}^{m} }$

We apply this law of exponents to get,

${36}^{( - \frac{1}{2} )} = \frac{1}{ {36}^{( \frac{1}{2} )} }$

We cab rewrite the given expression to obtain;

${36}^{( - \frac{1}{2} )} = \frac{1}{ \sqrt{36} }$

This will simplify to give us,

${36}^{( - \frac{1}{2} )} = \frac{1}{ 6 }$

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3 years ago

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HElP IM GIVING BRAINILYIST

pogonyaev

Answer:

D.

Step-by-step explanation:

The difference in pizza delivered between driver A and driver B is 10 pizzas.

We can find this by doing 20-10 which is 10.

The MAD is 2.

D says that Driver A has less pizzas delivered than Driver B by 5 MADs. Since 1 MAD is 2, 5 MADs is 10.

Meaning D says that driver A delivered 10 less pizzas than Driver B, which is correct.

Hope this answer helped! :)

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URGENT !!!!!!!!! Please answer correctly !!!!! Will be marking Brianliest !!!!!!!!!!!!!!!!

Morgarella [4.7K]

-2/5
Step by Step :
18 - 8 = 10
-15 - 10 = -25
10/-25 = -2/5

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3 years ago

Which numbers are factors of 42? Check all that apply. 1 2 3 4 6 8

defon

Answer:

1, 2, 3, 6,

Step-by-step explanation:

1*42

2*21 all = 42

3*14

6*7

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Noah says to find 20% of a number he divides the number by 5. Is this true explain your answer

Nutka1998 [239]

Answer:

yes

Step-by-step explanation:

note that 20% = $\frac{20}{100}$ = $\frac{1}{5}$

Hence to find 20% of a number, dividing the number by 5 is correct

20% of £30 = $\frac{30}{5}$ = £6

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3 years ago