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2 years ago

10 x (5x) = ? help pls

Mathematics

2 answers:

Anuta_ua [19.1K]2 years ago

8 0

Answer:

hey uh I just wanted to say thank you and helping Yuri she is my world I could not be the person I am without her

Step-by-step explanation:

Marta_Voda [28]2 years ago

3 0

Answer:57

Step-by-step explanation:

You might be interested in

What is the probability that a random person who tests positive for a certain blood disease actually has the disease, if we know

xeze [42]

Answer:

Step-by-step explanation:

Hello!

Any medical test used to detect certain sicknesses have several probabilities associated with their results.

Positive (test is +) ⇒ P(+)

True positive (test is + and the patient is sick) ⇒ P(+ ∩ S)

False-positive (test is + but the patient is healthy) ⇒P(+ ∩ H)

Negative (test is -) ⇒ P(-)

True negative (test is - and the patient is healthy) ⇒ P(- ∩ H)

False-negative (test is - but the patient is sick) ⇒ P(- ∩ S)

The sensibility of the test is defined as the capacity of the test to detect the sickness in sick patients (true positive rate).

⇒ P(+/S) = P(+ ∩ S)

P(S)

The specificity of the test is the capacity of the test to have a negative result when the patients are truly healthy (true negative rate)

⇒ P(-/H) = P(- ∩ H)

P(H)

For this particular blood disease the following probabilities are known:

1% of the population has the disease: P(S)= 0.01

95% of those who are sick, test positive for it: P(+/S)= 0.95 (sensibility of the test)

2% of those who don't have the disease, test positive for it: P(+/H)= 0.02

The probability of a person having the blood sickness given that the test was positive is:

P(S/+)= P(+ ∩ S)

P(+)

The first step you need to calculate the intersection between both events + and S, for that you will use the information about the sickness prevalence in the population and the sensibility of the test:

P(+/S) = P(+ ∩ S)

P(S)

P(+/S)* P(S) = P(+ ∩ S)

P(+ ∩ S) = 0.95*0.01= 0.0095

The second step is to calculate the probability of the test being positive:

P(+)= P(+ ∩ S) + P(+ ∩ H)

Now we know that 1% of the population has the blood sickness, wich means that 99% of the population doesn't have it, symbolically: P(H)= 0.99

Then you can clear the value of P(+ ∩ H):

P(+/H) = P(+ ∩ H)

P(H)

P(+/H)*P(H) = P(+ ∩ H)

P(+ ∩ H) = 0.02*0.99= 0.0198

Next you can calculate P(+):

P(+)= P(+ ∩ S) + P(+ ∩ H)= 0.0095 + 0.0198= 0.0293

Now you can calculate the asked probability:

P(S/+)= P(+ ∩ S) = 0.0095 = 0.32

P(+) 0.0293

I hope it helps!

6 0

2 years ago

5x increased by 120%

Vlad [161]

"Increased by" means to multiply.

First, change the percentage to a number.

% ⇒ # : %/100

120(%) (120 ÷ 100) = 1.2

Now, you multiply.

5x × 1.2 = 6x

So, your answer is 6x.

3 0

3 years ago

Arabica coffee costs $28 per pound and Robusta coffee

Soloha48 [4]

Given parameters:

Cost per pound of Arabica coffee = $28 per pound

Cost of Robusta coffee = $8.75

Given number of pounds of Robusta Coffee = 3 pounds

Total cost of blend per pound = $15.50

Unknown:

Number of pounds of Arabica coffee = ?

Solution:

Let the number of pounds of Arabica coffee = A;

We have to interpret this problem algebraically and solve;

28A + 8.75(3) = 15.5(A + 3)

Now solve the expression above for A;

28A + 26.25 = 15.5A + 46.5

28A - 15.5A = 46.5 - 26.25

12.5A = 20.25

A = 1.62

Number of pounds of Arabica Coffee is 1.62 pound

3 0

3 years ago

4 team mates share 5 pizza show how much each person gets

Murrr4er [49]

Answer:

1 1/2

Step-by-step explanation:

Each person would equally get 1 pizza and the 1/2 of the last pizza

8 0

2 years ago

Find all solutions to the equation. 7 sin2x - 14 sin x + 2 = -5

Alenkinab [10]

7sin²x-14sinx+2= -5
7sin²x-14sinx+7=0
7(sin²x-2sinx+1)=0
sin²x-2sinx+1=0
(sinx-1)(sinx-1)=0
sinx-1=0
sinx=1
$x= \frac{ \pi }{2} +2n \pi$ where n is an integer

4 0

3 years ago