1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
egoroff_w [7]
2 years ago
9

Quick algebra 1 question for some points!

Mathematics
1 answer:
Kazeer [188]2 years ago
7 0
<h2>3)</h2>

\frac{y}{x}  =  \frac{4}{ - 3}  =  \frac{8}{ - 6}  =  \frac{12}{ - 9}  \\ this \: relation \: holds \: so \: y \: varies \\ directly \: with \: x

\frac{ 4}{3} m =  \frac{8}{ - 6}  \\ m =  \frac{ \frac{ - 8}{6} }{ \frac{3}{ - 4} }  =  \frac{8 \times 4}{6 \times 3}  =  \frac{32}{18}  = 2 \\ multipling \: by \: 2

<h2>2)</h2>

\frac{y}{x}  =  \frac{ - 40}{ - 0.5}  =  \frac{8}{2.5}  =  \frac{5}{4}  \\  \frac{y}{x}  = 80 = 3.2 = 1.25 \\ this \: is \: untrue \: so \: y \: is \: not \\ varying \: directly \: with \: x

no \: constant \: of \: variation

<h2>4)</h2><h2>\frac{y}{x}  =  \frac{21}{3}  =  \frac{31.5}{4.5}  =  \frac{38.5}{5.5 \\  }  \\  \frac{y}{x}  = 7 = 7 = 7 \\ y \: varies \: directl y\: with \: x \\ consant \: of \: var =  \frac{y}{x}  = 7</h2><h2>5)</h2>

\frac{y}{x}  =  \frac{30}{6}  =  \frac{35}{7}  =  \frac{96}{8}  \\  \frac{y}{x}  = 5 = 5 = 12 \\ y \: does \: not \: vary \: directly \: with \: x

You might be interested in
Jerry is 8 years younger than Patricia. Six years ago, Patricia was 3 times as old as Jerry was then. Which system of equations
MissTica
<span>Jerry is 8 years younger than Patricia, so: (1): Jerry = Patricia - 8 Six years ago, Patricia was 3 times as old as Jerry was then, so: (2): (Patricia - 6) = (Jerry - 6)*3 Putting equation 1 in to equation 2 (Patricia - 6) = (Patricia - 8 - 6)*3 Patricia - 6 = 3Patricia - 42 36 = 2Patricia Patricia = 18 And so Jerry = 10</span>
4 0
3 years ago
Let Y1 and Y2 be independent exponentially distributed random variables, each with mean 7. Find P(Y1 &gt; Y2 | Y1 &lt; 2Y2). (En
ArbitrLikvidat [17]

<em>Y</em>₁ and <em>Y</em>₂ are independent, so their joint density is

f_{Y_1,Y_2}(y_1,y_2)=f_{Y_1}(y_1)f_{Y_2}(y_2)=\begin{cases}\frac1{49}e^{-\frac{y_1+y_2}7}&\text{for }y_1\ge0,y_2\ge0\\0&\text{otherwise}\end{cases}

By definition of conditional probability,

P(<em>Y</em>₁ > <em>Y</em>₂ | <em>Y</em>₁ < 2 <em>Y</em>₂) = P((<em>Y</em>₁ > <em>Y</em>₂) and (<em>Y</em>₁ < 2 <em>Y</em>₂)) / P(<em>Y</em>₁ < 2 <em>Y</em>₂)

Use the joint density to compute the component probabilities:

• numerator:

P((Y_1>Y_2)\text{ and }(Y_1

=\displaystyle\frac1{49}\int_0^\infty\int_{\frac{y_1}2}^{y_1}e^{-\frac{y_1+y_2}7}\,\mathrm dy_2\,\mathrm dy_1

=\displaystyle-\frac17\int_0^\infty\int_{-\frac{3y_1}{14}}^{-\frac{2y_1}7}e^u\,\mathrm du\,\mathrm dy_1

=\displaystyle-\frac17\int_0^\infty\left(e^{-\frac{2y_1}7} - e^{-\frac{3y_1}{14}}\right)\,\mathrm dy_1

=\displaystyle-\frac17\left(-\frac72e^{-\frac{2y_1}7} + \frac{14}3 e^{-\frac{3y_1}{14}}\right)\bigg|_0^\infty

=\displaystyle-\frac17\left(\frac72 - \frac{14}3\right)=\frac16

• denominator:

P(Y_1

(I leave the details of the second integral to you)

Then you should end up with

P(<em>Y</em>₁ > <em>Y</em>₂ | <em>Y</em>₁ < 2 <em>Y</em>₂) = (1/6) / (2/3) = 1/4

5 0
2 years ago
What are the zeros of the polynomial function? f(x)=x^3+x^2−9x−9
ella [17]

Answer:

1: x = -1

2: x = 3

3: x = -3

Step-by-step explanation:

f(x)=<u>x^3+x^2</u>−9x−9

f(x)=x^2<u>(</u>x+1) <u>−9x−9</u>

f(x) = x^2<u>(x+1)</u> - 9<u>(x+1)</u>

f(x)= (x+1)<u>(x^2-9)</u>

f(x) =(x+1)(x-3)(x+3)

8 0
3 years ago
Read 2 more answers
A cone and cylinder have the same radius and the same volume. The cylinder has a height of 10m and a radius of 12m. Find the vol
Novay_Z [31]

Answer:

4523.89m

So for a cylinder it is radius times two. Then multiply your answer by pie 3.14 then times high.

7 0
2 years ago
Read 2 more answers
The numbers in this sequence increase by the same amount each time.
PilotLPTM [1.2K]

Answer:

2, 4, 6, 8 , 10

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • What is the answer to this problem
    13·1 answer
  • What is 5.96 as a fraction
    7·1 answer
  • Mr. sharrone can paper a room in 3 hours. his assistant needs 5 hours. if mr. sharrone works 1 hour and then his assistant compl
    8·1 answer
  • 164,215 rounded to the nearest ten thousand
    14·2 answers
  • How do you simplify 2 sin (4theta) cos (4theta), using a double-angle formula?
    7·1 answer
  • Roscoe's family has dinner at a restaurant. The total cost is $103.80. This includes 5% tax and 15% tip on the ore tax amount. H
    5·1 answer
  • At a particular academically challenging high school, the average gpa of a high school senior is known to be normally distribute
    14·2 answers
  • A rhombus, which is a quadrilateral with 4 equal sides, is plotted on the coordinate plane. The coordinates of the vertices are:
    6·1 answer
  • **PLS HELP DUE SOON**
    6·2 answers
  • HELP ME PLS
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!