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3 years ago

If the test for a disease is accurate 45% of the time, How often will it come back negative if a patient has the disease?

Mathematics

1 answer:

Dafna1 [17]3 years ago

7 0

D. 55% of the time

45% of the time it will say positive

The other 55% of the time will come back negative.

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How to find length of sides for right triangle knowing angles?

kifflom [539]

U can use the cosine or sine rules depending on the question/triangle

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4 years ago

You have one type of nut that sells for $2.80/lb and another type of nut that sells for $9.60/lb. You would like to have 20.4 lb

max2010maxim [7]

Answer:11.396Ibs of nuts that cost $9.60/Ib and 9.014Ibs that cost $2.80/Ib

Step-by-step explanation:

First we find the cost of the supposed mixture we are to get by selling it $6.60/Ib which weighs 20.41Ibs

Which is 6.6 x 20.41 = $134.64

Now we label the amount of mixture we want to get with x and y

x = amount of nuts that cost $2.8/Ib

y = amount of nuts that cost $9.6/Ib

Now we know the amount of mixture needed is 20.41Ibs

So x + y = 20.41Ibs

And then since the price of the mixture to be gotten overall is $134.64

We develop an equation with x and y for that same amount

We know the first type of nut is $2.8/Ib

So for x amount we have 2.8x

For the second type of nut that is $9.6/Ib

For y amount we have 9.6y

So adding these to equate to $134.64

2.8x + 9.6y = 134.64

So we have two simultaneous equations

x + y = 20.41 (1)

2.8x + 9.6y = 57.148 (2)

We can solve either using elimination or factorization method

I'm using elimination method

Multiplying the first equation by 2.8 so that the coefficient of x for both equations will be the same

2.8x + 2.8y = 57.148

2.8x + 9.6y = 134.64

Subtracting both equations

-6.8y = -77.492

Dividing both sides by -6.8

y = -77.492/-6.8 =11.396

y = 11.396Ibs which is the amount of nuts that cost $9.6/Ib

Putting y = 11.396 in (1)

x + y = 20.41 (1)

x +11.396 = 20.41

Subtract 11.396 from both sides

x +11.396-11.396 = 20.41-11.396

x = 9.014Ibs which is the amount of nuts that cost $2.8/Ibs

8 0

3 years ago

HELP PLEASE I NEED IT ASAP

Akimi4 [234]

Answer:

849.9 cm squared

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

What is a corresponding angle?

sasho [114]

Answer:

the angles which occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal

Step-by-step explanation:

Just do what i put up there

6 0

3 years ago

Giselle's youth club sells cookies to fund their trips and activities. Each year they need to earn $1,247 from selling cookies.

algol [13]

Price per box, P = $1.45 .

Money left, M = $1247 - $472.70 = $774.3 .

Let, number of boxes are x.

So,

$x = \dfrac{774.3}{1.45}\\\\x = 534\ boxes$

Therefore, they have to sell 534 more boxes.

Hence, this is the required solution.

6 0

3 years ago