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Musya8 [376]
2 years ago
10

The weight of Jane and Jessica was in the ratio of 8 : 9. Jane gained 2 kg while Jessica lost 4 kg. They then had the same weigh

t. What was Jane's weight at first?
Mathematics
1 answer:
postnew [5]2 years ago
3 0

Answer:

  48 kg

Step-by-step explanation:

The given relations can be used to write a system of equations for the two weights. Those can be solved to find Jane's weight.

__

<h3>setup</h3>

Let x and y represent Jane's and Jessica's original weight, respectively. The ratio of weights was ...

  x/y = 8/9

After the changes in weight, they were equal:

  x+2 = y-4

__

<h3>solution</h3>

Adding 4 to the second equation, we have an expression for y that can be substituted into the first equation.

  y = x +6 . . . . . . . . . . solve the second equation for y

  x/(x+6) = 8/9 . . . . . . substitute for y in the first equation

  9x = 8(x +6) . . . . . . . multiply by 9(x+6)

  x = 48 . . . . . . . . . . . simplify and subtract 8x

Jane weighed 48 kg at first.

_____

<em>Alternate solution</em>

The original difference in "ratio units" was 9-8 = 1 ratio unit. We find that this corresponds to 6 kg after the weight changes make the weights equal. Then 8 ratio units will be 8(6 kg) = 48 kg—Jane's original weight.

(This mental solution is virtually the same as the solution using equations shown above.)

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A certain disease occurs most frequently among older women. Of all age groups, women in their 60s have the highest rate of breas
Law Incorporation [45]

Answer:

The probability that a woman in her 60s has breast cancer given that she gets a positive mammogram is 0.0276.

Step-by-step explanation:

Let a set be events that have occurred be denoted as:

S = {A₁, A₂, A₃,..., Aₙ}

The Bayes' theorem states that the conditional probability of an event, say <em>A</em>ₙ given that another event, say <em>X</em> has already occurred is given by:

P(A_{n}|X)=\frac{P(X|A_{n})P(A_{n})}{\sum\limits^{n}_{i=1}{P(X|A_{i})P(A_{i})}}

The disease Breast cancer is being studied among women of age 60s.

Denote the events as follows:

<em>B</em> = a women in their 60s has breast cancer

+ = the mammograms detects the breast cancer

The information provided is:

P(B) = 0.0312\\P(+|B)=0.81\\P(+|B^{c})=0.92

Compute the value of P (B|+) using the Bayes' theorem as follows:

P(B|+)=\frac{P(+|B)P(B)}{P(+|B)P(B)+P(+|B^{c})P(B^{c})}

            =\frac{(0.81\times 0.0312)}{(0.81\times 0.0312)+(0.92\times (1-0.0312)}\\

            =\frac{0.025272}{0.025272+0.891296}

            =0.02757\\\approx0.0276

Thus, the probability that a woman in her 60s has breast cancer given that she gets a positive mammogram is 0.0276.

4 0
3 years ago
Read 2 more answers
(2+5xyz-6tv²c)-(11-5yxz-2ctv²)​
Effectus [21]

Answer:

-4ctv² + 10xyz - 9

Step-by-step explanation:

(2 + 5xyz - 6tv²c) - (11 - 5yxz - 2ctv²)

2 + 5xyz - 6tv²c - 11 + 5yxz + 2ctv²

-4ctv² + 10xyz - 9

I hope this helps!

5 0
2 years ago
Please help give brainliest and 50 points
Wewaii [24]

The value of the output r(-3) in the given function is 2.

<h3>How to Interpret Graphs?</h3>

When we talk about graphs like this, it is pertinent to note that the x-values are the input values which would give us corresponding y-values which are the output values.

Now, we want to find r(-3) from the graph. This means we want to find the value on the y-axis when x = -3.

From the given graph, we see that when x = - 3, it is traced that the value of the output is y = 2.

Thus, the value of the output r(-3) in the given function is 2.

Read more about Linear Graph at; brainly.com/question/2306160

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4 0
1 year ago
Explain<br> ••••••••••••••••••••••••••
EleoNora [17]

Answer: 952 ft squared

Step-by-step explanation:

Surface area, is just the area of all the faces added together.

So, the sides we need to find are measuring:

Triangle side: 10 x 8

Triangle Face; 10 x 8

Square Face: 10 x 10

Square Face: 10 x 10

Rectangular Face: 14 x 10

Rectangular Face: 14 x 10

Bottom Rectangular face: 14 x 10

Side of the Triangular prism: 9 x 14

Side of the Triangular prism: 9 x 14

Because the triangle face has two of them, we only have to do one as opposed to dividing the same face twice.

So, we have a side of 80.

From here, it is just multiplication.

80 + 100 + 100 + 140 + 140 + 140 + 126 + 126 = 952 ft

8 0
3 years ago
I git dune wif this in 3 minits <br>782+821=___<br>2x2=___​
pshichka [43]
782 + 821 = 1,603


2x2 = 4
6 0
3 years ago
Read 2 more answers
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