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
LenKa [72]
2 years ago
11

Someone help me with the two math problems

Mathematics
2 answers:
BigorU [14]2 years ago
8 0

Answer:

13. x=0, x= -4

14. NO EXCLUDED VALUE

Step-by-step explanation:

13. set the denominator to equal to 0 = x^2 + 4x = 0

factor the expression x × (x + 4) = 0

separate into possible cases = x = 0 and x = -4

state the excluded value = x = 0 and x = -4

14. set the denominators equal to 9 = x^2 +81 = 0

the statement is false for any value if x = x € ℝ

skad [1K]2 years ago
4 0

Btw, you can just use photo math, its an app you can download on the app store. Just take a pic of the math problem and it'll show you the answer AND how to do it.

You might be interested in
Sasa bikes 25 miles everyday for two weeks. how many miles does she bike during this time?
kondor19780726 [428]
After two weeks sasa would have bike a total of 350 miles.
7 0
3 years ago
Read 2 more answers
Suppose data made available through a health system tracker showed health expenditures were $10,348 per person in the United Sta
nignag [31]

Answer:

a) 30.08% probability the sample mean will be within $100 of the population mean.

b) 0% probability the sample mean will be greater than $12,600

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the Central Limit Theorem.

Normal probability distribution

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this question, we have that:

\mu = 10348, \sigma = 2500, n = 100, s = \frac{2500}{\sqrt{100}} = 250

a. What is the probability the sample mean will be within ±$100 of the population mean?

This is the pvalue of Z when X = 100 divided by s subtracted by the pvalue of Z when X = -100 divided by s. So

Z = \frac{100}{250} = 0.4

Z = -\frac{100}{250} = -0.4

Z = 0.4 has a pvalue of 0.6554, Z = -0.4 has a pvalue of 0.3556

0.6554 - 0.3546 = 0.3008

30.08% probability the sample mean will be within $100 of the population mean.

b. What is the probability the sample mean will be greater than $12,600?

This is 1 subtracted by the pvalue of Z when X = 12600. So

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{12600 - 10348}{250}

Z = 9

Z = 9 has a pvalue of 1.

1 - 1 = 0

0% probability the sample mean will be greater than $12,600

5 0
3 years ago
Find the coordinates of
antoniya [11.8K]

Answer:

  B = (6, 4)

Step-by-step explanation:

You know that the midpoint is calculated as ...

  M = (A +B)/2

Solving this for B, we find ...

  2M = A + B

  B = 2M - A

Filling in the coordinate values, we get ...

  B = 2(5, -2) -(4, -8) = (2·5-4, 2(-2)+8)

  B = (6, 4)

6 0
4 years ago
Who ever knows what 12×75 is I'll give brainliest ​
nalin [4]

Answer:

900

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
a zoologist hides in a bush 200 feet away from a tree inhabited by a family of monkeys. if the zoologist is looking up at an ang
Nastasia [14]

Answer:

\displaystyle  53.6ft

Step-by-step explanation:

<u>refer</u><u> the</u><u> attachment</u>

let the height be h

since we are given the adjacent side and want to figure out opposite side we'll use tan function

so our equation is

\displaystyle  \tan( {15}^{ \circ} )  =  \frac{h}{200}

cross multiplication:

\displaystyle  h = 200\tan( {15}^{ \circ} )

by using calculator we acquire:

\displaystyle  h  \approx 53.6ft

hence,

about <u>5</u><u>3</u><u>.</u><u>6</u><u>f</u><u>t</u> high in the tree ate monkeys

4 0
3 years ago
Other questions:
  • 8x + 11 + 3x + 11 + 39 = 180
    15·2 answers
  • How many lines of rotational symmetry does this shape have?
    11·1 answer
  • How to turn negative mixed fraction into decimal
    6·1 answer
  • What is the value of x?
    6·1 answer
  • Can anyone please tell me which would be the correct answer for the last three questions. Thanks!
    7·1 answer
  • Find the slope and y intercept<br> y=2
    8·1 answer
  • Can somebody help me with this question
    9·1 answer
  • -10y + 18 = -3(5y -7) +5y
    5·2 answers
  • Solve the inequality: 14-0.6t&gt;2
    12·2 answers
  • Def is a right triangle.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!