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skelet666 [1.2K]
3 years ago
10

I need help with all of these plz some one help

Mathematics
1 answer:
Vitek1552 [10]3 years ago
4 0
1. f(5)=-39

2. g(-2)= -21

4. f(7)=19

9. x=7

Please vote my answer brainliest. thanks!
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A bag contains 6 blue marbles, 10 red marbles, and 9 green marbles. If two marbles are drawn at random without replacement, what
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<u>Problem</u>

A bag contains 6 blue marbles, 10 red marbles, and 9 green marbles. If two marbles are drawn at random without replacement, what is the probability that two red marbles are drawn?

<u>Work </u>

Probability = no. of favorable outcomes /total no. of outcomes

Probability of getting a blue marble=5/5+6+9=5/20

Probability of getting a red marble=6/20−1=6/19

5/20×6/19

<u>Answer</u>

3/20

So it is C.

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2 years ago
1. Kalena was asked to prove ifx(x - 1)(x + 1) = x3 - X represents a polynomial identity. She
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Answer:

C. Kalena made a mistake in Step 3. The justification should state: -x²

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Step-by-step explanation:

Given the function x(x - 1)(x + 1) = x3 - X

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We will need to show if the two equations are equal.

Starting from the RHS with function x³-x

First we will factor out the common factor which is 'x' to have;

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Factorising x²-1 using the difference of two square will give;

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Factorising x(x+1) gives x²+x, therefore

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The function x³-x²+x²-x gotten shows that kelena made a mistake in step 3, the justification should be -x²+x² not -x-x²

6 0
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