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3 years ago

Y = 3x -1 Y = 2x + 3

Mathematics

1 answer:

Shalnov [3]3 years ago

3 0

Answer:

x = 4

y = 11

Step-by-step explanation:

You can make the equations 3x - 1 = 2x + 3

x = 4

y = 11

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12.what is the probability that a boy and a girl chosen randsomly will be seniors?

zhenek [66]

$\frac{\textbf{1}}{\textbf{20}}$

Step-by-step explanation:

Probability= $\frac{\text{number of favourable outcomes}}{\text{total number of outcomes}}$

Probability for a randomly chosen girl to be senior= $\frac{\text{number of senior girls}}{\text{total number of girls}}$

Probability for a randomly chosen girl to be senior= $\frac{7}{8+11+9+7}=\frac{7}{35}=\frac{1}{5}$

Probability for a randomly chosen boy to be senior= $\frac{\text{number of senior boys}}{\text{total number of boys}}$

Probability for a randomly chosen girl to be senior= $\frac{9}{10+7+10+9}=\frac{9}{36}=\frac{1}{4}$

For two independent events,

Probability for both event 1 and event 2 to take place= $\text{probability of event 1} \times \text{probability of event 2}$

Since choosing boys and girls is independent,

Probability for both boy an girl chosen to be senior= $\text{probability for boy to be senior}\times\text{probability for girl to be senior}$

Probability for both boy and girl chosen to be senior= $\frac{1}{5} \times \frac{1}{4} = \frac{1}{20}$

So,required probability is $\frac{1}{20}$

3 0

3 years ago

I need the answers to #1,#2 and #3

Ede4ka [16]

The answers are #1 45 #2 24 #3 10

6 0

3 years ago

Simplify the expression: [15 +3(2) - 0]0 A) 4 B) -1 C) 0 D) 3

raketka [301]

Answer:

The answer is C. So yeah.

3 0

3 years ago

Read 2 more answers

1-5x + 3y 45 2x+3y = 24

Norma-Jean [14]

Answer:

The answer is 1-5x+135y

Step-by-step explanation: multiply the numbers 3 and 45 which give you 135

3 0

3 years ago

A psychologist takes an SRS of 404040 people in their twenties and 606060 people in their fifties and surveys them about their a

Leto [7]

Answer: Approximately normal, because we expect 19.2 successes and 20.8 failures from people in their twenties, and 16.8 and 43.2 from people in their fifties, and all of these counts are at least 10.

Step-by-step explanation:

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3 years ago