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
timofeeve [1]
3 years ago
9

Evaluate : f(x) = x^2 - 2x + 1 , x = 3

Mathematics
1 answer:
den301095 [7]3 years ago
8 0

Answer:

4

Step-by-step explanation:

3^2=9

-2 times 3 = -6

9-6+1=4

You might be interested in
A charity receives 2025 contributions. Contributions are assumed to be mutually independent and identically distributed with mea
uysha [10]

Answer:

The 90th percentile for the distribution of the total contributions is $6,342,525.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal probability distribution

Problems of normally distributed samples are solved using 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.

For sums of size n, the mean is \mu*n and the standard deviation is s = \sqrt{n}*\sigma

In this question:

n = 2025, \mu = 3125*2025 = 6328125, \sigma = \sqrt{2025}*250 = 11250

The 90th percentile for the distribution of the total contributions

This is X when Z has a pvalue of 0.9. So it is X when Z = 1.28. Then

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

By the Central Limit Theorem

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

1.28 = \frac{X - 6328125}{11250}

X - 6328125 = 1.28*11250

X = 6342525

The 90th percentile for the distribution of the total contributions is $6,342,525.

3 0
2 years ago
Solve 2(x+1)=2x+2<br><br> A. All real numbers<br> B. No solution<br> C. 0<br> D. 1
frez [133]

Answer: All real numbers

Step-by-step explanation:

All real numbers

Interval Notation:

( − ∞ , ∞ )

(-∞,∞)

5 0
3 years ago
Read 2 more answers
Please help asap, this is timed!!!!!!<br> I'll mark brainliest!
Leto [7]
Hi! i think it’s d, just by process of elimination!! it cant be any of the others, and d estimates to be right.
4 0
2 years ago
Dequan is training for a marathon. He runs 20 miles every 4 days. What is the unit rate for Dequan?
KonstantinChe [14]

Answer:

Dequan walks 5 miles per day.

Step-by-step explanation:

So solve this problem, we just need to divide 20 miles by 4 days.

20 ÷ 4 = 5

Therefore, Dequan walks 5 miles per day.

Hope this helps! :D

5 0
2 years ago
Read 2 more answers
Question 2 of 5
Mice21 [21]

Answer:

30

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • Yesterday, the snow was 2 feet deep in front of Archie’s house. Today, the snow depth dropped to 1.6 feet because the day is so
    9·2 answers
  • Which is the best estimate of the total number and then 5 and 6 as well please this is to hard
    13·1 answer
  • What are the coordinates of the image of vertex D after a reflection across the x-axis? (5, 3) (–5, –3) (–3, 5) (3, –5)
    14·2 answers
  • Three aluminum cans can be recycled to make a new can. How many new cans can eventually be made from 243 aluminum cans? (Remembe
    8·1 answer
  • Find the volume of a cylinder with a diameter of 10 inches and a heigth of 20 inches
    10·2 answers
  • Rachel has 8 Boston crème donuts and 4 glazed donuts to put in boxes. She wants each box to contain
    9·1 answer
  • Answer plz plz plz plz plz​
    15·2 answers
  • Find g(-6) if g(x) = -5x – 2
    11·1 answer
  • Brainly sucks d ï ç k no one answers on here​
    12·1 answer
  • Jerome's sister told him to multiply both the amount of water and the amount of drink
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!