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3 years ago

8. Write an inverse variation equation relating x and y when x = 18 and y = 4.5. (64) help pliz

Mathematics

1 answer:

mr Goodwill [35]3 years ago

3 0

Answer:

answer are

a.k=13.5;13.5y=x

b.k=1.5;y=1.5x

c.k=1.5;y=1.5/x

d.k=13.5;xy=13.5

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PLEASE HELP ME ANSWER IF YOU KNOW!!!!!!!!!1111

Novay_Z [31]

Answer:

20,000 divided by 4,250

Step-by-step explanation:

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3 years ago

A test to determine whether a certain antibody is present is 99.1% effective. This means that the test will accurately come bac

avanturin [10]

Answer:

The probability that all the six people will test negative for the antibody is 0.9472.

The probability that the test comes back positive for at least one of the six people is 0.0528

Step-by-step explanation:

Consider the provided information.

probability that antibody is present will be effective is 99.1% and not present is 99.1% of the time.

Part (A)What is the probability that the test comes back negative for all six people? 

Let P(X)= P(Antibody not present)

We want test comes back negative for all six that means antibody is present for all six. Thus X=0

$P(X=0)=0.991\times0.991\times0.991\times0.991\times0.991\times0.991\\P(X=0)=0.9472$

The probability that all the six people will test negative for the antibody is 0.9472.

Part (B) What is the probability that the test comes back positive for at least one of the six people?

$P(X \geq1)=1-P(X=0)$

$P(X \geq1) = 1-0.9472$

$P(X \geq1) = 0.0528$

Hence, the probability that the test comes back positive for at least one of the six people is 0.0528

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3 years ago

How many 4-digit numbers can be formed from the digits 1, 2, 3, 4, 5, 6 and 7 which are divisible by 5 when none of the digits a

Masja [62]

Answer:

120 4-digit numbers.

Step-by-step explanation:

For the numbers to be divisible by 5 they must end in 5.

So the total number of first 3 digits of the 4-digit number are given by the

number of permutations of 3 from the numbers 1,2,3,4,6 and 7 (6 digits)

= 6P3

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2 years ago

A polygon is regular if each of its sides has the same length. Find the perimeter of the regular polygon.

OleMash [197]

Answer: 6units

Step-by-step explanation:

Since it is a regular polygon, and it has 3 equal sides it means the polygon is a quadrilateral.

From the diagram,

5 - 2x = -4x + 9 ( side of quadrilateral )

Solving for x in the equation

-2x + 4x = 9 - 5 ( collection of like terms in simple linear equation )

2x = 4

Divide through by the coefficient of x which is 2

x = 2.

Therefore, the perimeter of the polygon which equals to the total length of the polygon is

Perimeter = 2 + 2 + 2

= 6units

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3 years ago

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inysia [295]

Answer:

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Step-by-step explanation:

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2 years ago

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8. Write an inverse variation equation relating x and y when x = 18 and y = 4.5. (64) help pliz​

8. Write an inverse variation equation relating x and y when x = 18 and y = 4.5. (64) help pliz