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
liraira [26]
3 years ago
7

Calculate the x-intercepts of the quadratic y=9xsquared+3x

Mathematics
1 answer:
Dovator [93]3 years ago
3 0
To find the x-intercept, put y=0

9x^2 +3x=0
3x(3x+1)=0

x=0 or x=-1/3
You might be interested in
You believe the population is normally distributed. Find the 80% confidence interval. Enter your answer as an open-interval (i.e
victus00 [196]

You intend to estimate a population mean μ from the following sample. 26.2 27.7 8.6 3.8 11.6 You believe the population is normally distributed. Find the 80% confidence interval.  Enter your answer as an open-interval (i.e., parentheses) accurate to twp decimal places.

Answer:

The  Confidence interval = (8.98 , 22.18)

Step-by-step explanation:

From the given information:

mean = \dfrac{ 26.2+ 27.7+ 8.6+ 3.8 +11.6 }{5}

mean = 15.58

the standard deviation \sigma = \sqrt{\dfrac{\sum(x_i - \mu)^2 }{n}}

the standard deviation = \sqrt{\dfrac{(26.2  - 15.58)^2 +(27.7 - 15.58)^2 +(8.6  - 15.58)^2 + (3.8  - 15.58)^2  + (11.6  - 15.58)^2  }{5 }  }

standard deviation = 9.62297

Degrees of freedom df = n-1

Degrees of freedom df = 5 - 1

Degrees of freedom df = 4

For df  at 4 and 80% confidence level, the critical value t from t table  = 1.533

The Margin of Error M.O.E = t \times \dfrac{\sigma}{\sqrt{n}}

The Margin of Error M.O.E = 1.533 \times \dfrac{9.62297}{\sqrt{5}}

The Margin of Error M.O.E = 1.533 \times 4.3035

The Margin of Error M.O.E = 6.60

The  Confidence interval = ( \mu  \pm M.O.E )

The  Confidence interval = ( \mu  +  M.O.E , \mu - M.O.E )

The  Confidence interval = ( 15.58 - 6.60 , 15.58 + 6.60)

The  Confidence interval = (8.98 , 22.18)

7 0
3 years ago
Free points: this is because of all the kindness I have seen on brainly:
VashaNatasha [74]
The answer is 35450 :)
8 0
3 years ago
Read 2 more answers
49 more than the quotient of an unknown number and 12 is 53. What is the value of the unknown number?
nalin [4]
The unknown number is 48 using the equation: x ÷ 12 +49=53 subtract 49 from both sides and get x ÷ 12 = 4 multiplying by 12 on both side to get rid of the ÷12 and get the final answer of x=48.
6 0
3 years ago
??????????????????????????????????
lina2011 [118]

Answer:

2x + 4 I would assume

3 + 1 = 4

(combining like terms)

6 0
2 years ago
Read 2 more answers
Kyle mows4 lawns a day 4 day a week 4 week a month and 4 months a year he makes $25 per lawn how much money did he make last yea
denis-greek [22]

Lets break this down step by step.

4+4+4+4=16 lawns a week.

16+16+16+16=64 lawns a month.

64+64+64+64=256 lawns a year.

Then we take 256 x $25 to get $6,400 last year.

6,400<---Answer

-Seth

8 0
2 years ago
Other questions:
  • An elephant eats 5% of his body weight each day if he eats 300 pounds of food,how much does it weigh?
    11·1 answer
  • Solve + (-4) = -2. 6 -18 18 -2
    9·1 answer
  • utilizando la equivalencia indicada, resuelve el siguiente ejercicio: 1 pulgada = 2.54cm 4.2 cm = _____ pulgadas
    15·1 answer
  • The figure below shows the ideal pattern of movement of a herd of cattle, with the arrows showing the movement of the handler as
    14·1 answer
  • 2-1+9/3+21-2/23+31-23=
    15·1 answer
  • Anyone know how to solve this ?? I need help
    8·1 answer
  • Evaluate −6 − (−4). (1 point)
    14·2 answers
  • Select the correct answer.
    7·1 answer
  • <img src="https://tex.z-dn.net/?f=4x%282xy%20%2B%203xy%29%20%2B%205x%283xy%20%2B%202xy%29" id="TexFormula1" title="4x(2xy + 3xy)
    12·1 answer
  • Which expression is a factor of 3y2 + 144 - 24
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!