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blagie [28]
3 years ago
13

There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 3 8 . There are 18 r

ed marbles in the bag and each is equally likely to be chosen. Work out how many marbles in total there must be.
Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
8 0

Answer:

There are 48 marbles in the bag

Step-by-step explanation:

red: blue : total

3                   8

there are 18 red

18/3 = 6

Multiply everything by 6

3*6                 8*6

18                    48

There are 48 marbles in the bag

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Which set of ordered pairs represents a function?
jasenka [17]

Answer:

The final set of ordered pairs represents a function.

Step-by-step explanation:

Each X value corresponds to exactly one y- value. Essentially, none of the x values are the same in the final set.

8 0
2 years ago
Simplify the expression below 13y+x-7y
soldier1979 [14.2K]

Answer: 5y + x

Step-by-step explanation: As you first step to this problem, change all your minus signs to plus negatives.

To simplify, we can only combine what are called our like terms and in this problem, we have one y-term and we have a pair of like terms in our x-terms.

So let's start by combining our y-terms.

13y + -7y simplifies to 5y.

Now we have one x-term so we have 5y + x.

7 0
3 years ago
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Write a numerical expression to represent the phrase.<br><br> the difference of 4 cubed and 25
7nadin3 [17]

Hello!

First, "the difference" of 2 numbers means you subtract these numbers.

Then, 4 cubed is written as follows:

4³

Subtract:

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[If necessary] Evaluate:

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Hope everything is clear.

Let me know if you have any questions!

Always remember: Knowledge is power!

3 0
2 years ago
What is the coefficient of the x5y5-term in the binomial expansion of (2x – 3y)10? 10C5(2)5(3)5 10C5(2)5(–3)5 –10C5(2)5(–3)5 10C
butalik [34]

ANSWER

10C_5(2)^{5}( - 3)^5

EXPLANATION

The given binomial expansion is:

{(2x - 3y)}^{10}

Compare this to

{(a + b)}^{n}

we have a=2x , b=-3y and n=10

We want to find the coefficient of the term

{x}^{5}  {y}^{5}

This implies that, r=5.

The terms in the expansion can be obtained using

T_{r+1}=nC_ra^{n-r}b^r

We substitute the given values to obtain;

T_{5+1}=10C_5(2x)^{10-5}(  - 3y)^5

T_{6}=10C_5(2x)^{5}(3y)^5

T_{6}=10C_5(2)^{5}( - 3)^5 {x}^{5}  {y}^{5}

Hence the coefficient is;

10C_5(2)^{5}( - 3)^5

5 0
3 years ago
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3 out of 5 picks are orange. If 12 picks are orange, has many picks are there in all.
hodyreva [135]
If 3 out of 5 are oranges, this means the ratio is 3 oranges for every 5 total.

If there are 12 oranges, this is 4 groups of 3 oranges.  You will need 4 groups of 5 total to make it equivalent.

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<u>3</u> x <u>4 </u>=  <u>12</u>
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7 0
3 years ago
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