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Brut [27]
2 years ago
15

20% of the students in the class play an instrument. if there are 35 students in class, how many play an instrument?

Mathematics
1 answer:
kondor19780726 [428]2 years ago
6 0

Answer:

7 students play an instrument.

Calculation:

35=100%

20%=[20×35]÷100

=7

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Q4.
Levart [38]

Probabilities are used to determine the chances of an event

  • The probability of choosing a black counter is 0.6
  • The probability that both counters are white is 0.16

<h3>(a) Probability of selecting two blacks</h3>

The probability is given as:

P(Black\ n\ Black)=0.36

Apply probability formula

P(Black) \times P(Black)=0.36

Express as squares

P(Black)^2=0.36

Take the square root of both sides

P(Black)=0.6

Hence, the probability of choosing a black counter is 0.6

<h3>(b) Probability of selecting two white counters</h3>

In (a), we have:

P(Black)=0.6

Using the complement rule, we have:

P(White) = 1 - P(Black)

So, we have:

P(White) = 1 -0.6

Evaluate

P(White) = 0.4

The probability that both counters are white is then calculated as:

P(White\ and\ White) = P(White) \times P(White)

So, we have:

P(White\ and\ White) =0.4 \times 0.4

P(White\ and\ White) =0.16

Hence, the probability that both counters are white is 0.16

Read more about probabilities at:

brainly.com/question/15858152

6 0
2 years ago
571 x ?
vampirchik [111]

Answer:

5

571

x 38

---------

4,568 <------571×

+3,213x <------571x

------------

36,698

3 0
2 years ago
The sum of a number and 8 is 15
kodGreya [7K]
You mean, what is this number?

we can rephrase it like this: the sum of a number x and 8 is 15

which is:

x+8=15

we subtract 8 from both sides and we get
x=7

so the answer is 7.
3 0
3 years ago
Read 2 more answers
WILL MARK BRAINLIEST!!! HELP!​
Virty [35]

Answer:

d) x=4

Step-by-step explanation:

\sqrt{x} +5 = \sqrt{x + 45}

(\sqrt{x} +5)^{2}   = (\sqrt{x + 45})^{2}

x + 10\sqrt{x} +25 = x + 45

10\sqrt{x}  = 20

divide 10 in both sides

(\sqrt{x}){2}  = (2){2}

x=4

8 0
3 years ago
Factor. x^2-5x-84 pls help
vagabundo [1.1K]

Answer:

(x-12) (x+7)

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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