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2 years ago

I need help I don't know how to do this

Mathematics

1 answer:

AveGali [126]2 years ago

4 0

Answer:

Step-by-step explanation:

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Ginny has 16 chocolate bars. She gives away ¾ of her chocolate bars to friends. How many chocolate bars did Ginny give away?

Phantasy [73]

Answer:

She gave away 12, so she still has 4.

Step-by-step explanation:

16 times .75 equals 12.

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2 years ago

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A box contains 5 red balls, 6 white balls and 9 black balls. Two balls are drawn at

valina [46]

Answer:

$P(Same)=\frac{61}{190}$

Step-by-step explanation:

Given

$Red = 5$

$White = 6$

$Black = 9$

Required

The probability of selecting 2 same colors when the first is not replaced

The total number of ball is:

$Total = 5 + 6 + 9$

$Total = 20$

This is calculated as:

$P(Same)=P(Red\ and\ Red) + P(White\ and\ White) + P(Black\ and\ Black)$

So, we have:

$P(Same)=\frac{n(Red)}{Total} * \frac{n(Red) - 1}{Total - 1} + \frac{n(White)}{Total} * \frac{n(White) - 1}{Total - 1} + \frac{n(Black)}{Total} * \frac{n(Black) - 1}{Total - 1}$

<em>Note that: 1 is subtracted because it is a probability without replacement</em>

$P(Same)=\frac{5}{20} * \frac{5 - 1}{20- 1} + \frac{6}{20} * \frac{6 - 1}{20- 1} + \frac{9}{20} * \frac{9- 1}{20- 1}$

$P(Same)=\frac{5}{20} * \frac{4}{19} + \frac{6}{20} * \frac{5}{19} + \frac{9}{20} * \frac{8}{19}$

$P(Same)=\frac{20}{380} + \frac{30}{380} + \frac{72}{380}$

$P(Same)=\frac{20+30+72}{380}$

$P(Same)=\frac{122}{380}$

$P(Same)=\frac{61}{190}$

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2 years ago

F(n) =5n + 8 when writing a mini prove what first step in evaluating f(-2)

denpristay [2]

Hope it helps you
Please mark it as brainliest

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2 years ago

I attached the question in the image below

djyliett [7]

Answer:

45°

Step-by-step explanation:

$tan^{-1}(1)$ = 45°

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2 years ago

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What is the value of 2 in 5,014,245?

Arlecino [84]

Your reasoning and your answer were both correct. Discuss with the teacher. ("Discuss". DON'T fight.)

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2 years ago