2 years ago

In a group of 30 children, 80%can’t swim how many children can’t swim

Mathematics

2 answers:

adoni [48]2 years ago

8 0

Answer:

Step-by-step explanation:

Allushta [10]2 years ago

3 0

80% is 0.8
30x0.8 is 24
So 24 cant swim

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Craig made 60% of 80 free throw attempts this season how many free throws has he made

Svetllana [295]

Answer:

Step-by-step explanation:

60% of 80 is the same as 60% times 80.

60% of 80 =

= 60% * 80

= 0.60 * 80

= 48

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3 years ago

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The average score on a standardized test is 750 points with a standard deviation of 50 points. What is the probability that a st

nalin [4]

The probability that student scored more than 850 we shall proceed as follows:
z=(x-μ)/σ
where:
x=850
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σ=50
thus
z=(850-750)/50
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2 years ago

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belka [17]

1. D

2. D

I don't know the answer to number 3 sorry.

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3 years ago

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I need help can u pleas help me thank have a blessed day.

Olin [163]

Answer:

I believe the answer is A

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2 years ago

The circle given by : x^2 + y^2 - 6y - 12 = 0 can be written as:

deff fn [24]

Step-by-step explanation:

Given equation of circle is,

${x}^{2} + {y}^{2} - 6y - 12 = 0 \\ by \: compairing \: it \: with \: \\ {x}^{2} + {y}^{2} + 2gx + 2fy = 0 \: we \: get \\2 g = 0 \: or \: g = 0 \\ 2f= - 6 \\ or \: f= - 3 \\ c = - 12$

again the another form of circle is,

${x}^{2} + {(y - k)}^{2} = 21 \\ or \: {x}^{2} + {y}^{2} - 2ky + {k}^{2} - 21 = 0 \\ by \: compairing \:it \: with \: \\ {x}^{2} + {y}^{2} + 2gx + 2fy = 0 \: we \: get \\ g = 0 \\f = - k \\ c = {k}^{2} - 21$

now equating the values of f in both equations,

-k=-3

i.e. k=3

therefore k=3

4 0

3 years ago