All categories

3 years ago

Plzzzzzzzzzzzzzz answer this!!

Mathematics

2 answers:

lawyer [7]3 years ago

7 0

Answer:

≈ 9.4 cm

Step-by-step explanation:

P(-4, -2), Q(4,3)

d= √(x2-x1)²+(y2-y1)²=√ (4+4)²+(3+2)²= √64+25 = √89 ≈ 9.4 cm

kirill [66]3 years ago

5 0

Answer:

9.4

Step-by-step explanation:

Hello! To solve this problem, you need to know the distance between two points formula. That is $\sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2 } \\$ . Now, just plug in the numbers from the equation. $x_{2}$ is -4, $x_{1}$ is 4, $y_{2}$ is -2, and $y_{1}$ is 3. So, then you have $\sqrt{(-4-4)^2+(-2-3)^2}$ , which is equal to $\sqrt{89$ . $\sqrt{89$ rounded to one decimal place is 9.4. I believe that is the right answer, please let me know if it helped.

You might be interested in

In Val's class, the ratio of students who ate enchiladas for lunch to the students who ate tacos was 14:20. Which of the followi

fgiga [73]

An equivalent ratio would be 7:10 or 70:100 or 42:60 and so on...

6 0

2 years ago

What is the value of -2(x + 5)?

Nataly_w [17]

Answer:

Expand by distributing terms.

-2x-2\times 5−2x−2×5

Simplify 2\times 52×5 to 1010.

-2x-10−2x−10

3 0

2 years ago

Will a geometric figure and its rotated image always,sometimes or never have the same perimeter

Alenkasestr [34]

It should always have the same perimeter if it stays the same geometric figure.

3 0

3 years ago

Read 2 more answers

2.5% of a population are infected with a certain disease. There is a test for the disease, however the test is not completely ac

Aleks04 [339]

Answer:

$P(disease/positivetest) = 0.36116$

Step-by-step explanation:

This is a conditional probability exercise.

Let's name the events :

I : ''A person is infected''

NI : ''A person is not infected''

PT : ''The test is positive''

NT : ''The test is negative''

The conditional probability equation is :

Given two events A and B :

P(A/B) = P(A ∩ B) / P(B)

$P(B) >0$

P(A/B) is the probability of the event A given that the event B happened

P(A ∩ B) is the probability of the event (A ∩ B)

(A ∩ B) is the event where A and B happened at the same time

In the exercise :

$P(I)=0.025$

$P(NI)= 1-P(I)=1-0.025=0.975\\P(NI)=0.975$

$P(PT/I)=0.904\\P(PT/NI)=0.041$

We are looking for P(I/PT) :

P(I/PT)=P(I∩ PT)/ P(PT)

$P(PT/I)=0.904$

P(PT/I)=P(PT∩ I)/P(I)

0.904=P(PT∩ I)/0.025

P(PT∩ I)=0.904 x 0.025

P(PT∩ I) = 0.0226

P(PT/NI)=0.041

P(PT/NI)=P(PT∩ NI)/P(NI)

0.041=P(PT∩ NI)/0.975

P(PT∩ NI) = 0.041 x 0.975

P(PT∩ NI) = 0.039975

P(PT) = P(PT∩ I)+P(PT∩ NI)

P(PT)= 0.0226 + 0.039975

P(PT) = 0.062575

P(I/PT) = P(PT∩I)/P(PT)

$P(I/PT)=\frac{0.0226}{0.062575} \\P(I/PT)=0.36116$

8 0

2 years ago

(a) Use the definition to find an expression for the area under the curve y = x3 from 0 to 1 as a limit. lim n→∞ n i = 1 Correct

Luba_88 [7]

Splitting up the interval of integration into $n$ subintervals gives the partition

$\left[0,\dfrac1n\right],\left[\dfrac1n,\dfrac2n\right],\ldots,\left[\dfrac{n-1}n,1\right]$

Each subinterval has length $\dfrac{1-0}n=\dfrac1n$ . The right endpoints of each subinterval follow the sequence

$r_i=\dfrac in$

with $i=1,2,3,\ldots,n$ . Then the left-endpoint Riemann sum that approximates the definite integral is

$\displaystyle\sum_{i=1}^n\frac{{r_i}^3}n$

and taking the limit as $n\to\infty$ gives the area exactly. We have

$\displaystyle\lim_{n\to\infty}\frac1n\sum_{i=1}^n\left(\frac in\right)^3=\lim_{n\to\infty}\frac{n^2(n+1)^2}{4n^3}=\boxed{\frac14}$

6 0

3 years ago