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
aev [14]
2 years ago
10

If f(x)=x2-1, what is f(4)?

Mathematics
2 answers:
Dmitriy789 [7]2 years ago
7 0
Explanation
4^2-1
16-1
Answer
15
Marta_Voda [28]2 years ago
7 0

Answer: 15

Step-by-step explanation:

Substitute 4 in x.  

You might be interested in
Y varies inversely as x. If y=5 and x=12, find y if x=4
yan [13]

Answer:

x igual 5 ,12,4

Step-by-step explanation:

xjxxixix

holghb

6 0
2 years ago
Enter the coordinates of the point on the unit circle at the given angle. 135° (-VII, VI Enter​
vekshin1
Related angle is 45 degrees, set up a triangle and use exact trig values to solve for x and y, then rationalise the denominators

4 0
3 years ago
Please help me! 15 pts! + Brainliest!
WITCHER [35]

Answer:

D

Step-by-step explanation:

It increased 3 meters every second if you look closely at chart

4 0
2 years ago
A researcher planned a study in which a crucial step was offering participants a food reward. It was important that three food r
lbvjy [14]

Answer:

Step-by-step explanation:

Hello!

A pilot study was conducted to test if three food rewards are equally appealing to the participants.

Of 60 participants surveyed:

16 preferred cupcakes (CC)

26 preferred candy bars (CB)

18 preferred dried apricots (DA)

If the three types of food are equally appealing for the participants, you'd expect that their proportions will be equal: P(CC)=P(CB)=P(DA)= 1/3

1.

The objective of this pilot study is to test if the observed frequencies follow a theoretical model/ distribution. To analyze this, you have to apply a Chi Square Goodness to Fit test. X^2=sum \frac{(O_i-E_i)^2}{E_i} ~~X^2_{k-1} Where k= number of categories of the variable.

For this example the statistical hypotheses are:

H₀: P(CC)=P(CB)=P(DA)= 1/3

H₁: At least one of the proportions isn't equal to the others.

2.

To calculate the expected frequencies for each category you have to use the formula: E_i= n* P_i where Pi represents the theoretical proportion for the i category, stated in the null hypothesis.

E_{CC}= n* P(CC)= 60*1/3= 20

E_{CB}= n*P(CB)= 60*1/3= 20

E_{DA}= n* P(DA)= 60* 1/3= 20

3.

The cutoff or critical value indicates the beginning of the rejection region for the hypothesis test. For the Chi-Square tests, the rejection region is always one-tailed to the right, meaning that you'll reject the null hypothesis if the value of the statistic is big. For the goodness to fit test you have k-1 degrees of freedom, so the critical value will be:

Assuming α: 0.05

X^2_{k-1;1-\alpha /2}= X^2_{2;0.975}= 7.378

The rejection region is then X²₂ ≥ 7.378

4.

X^2_{H_0}= \frac{(O_{CC}-E_{CC})^2}{E_{CC}} + \frac{(O_{CB}-E_{CB})^2}{E_{CB}}  + \frac{(O_{DA}-E_{DA})^2}{E_{DA}} = \frac{(16-20)^2}{20} +\frac{(26-20)^2}{20} +\frac{(18-20)^2}{20}=  \frac{14}{5}= 2.8

I hope this helps!

5 0
3 years ago
17 minutes left to answer
fomenos

9514 1404 393

Answer:

  can't be factored

Step-by-step explanation:

The two terms of 11t -23 have no common factors. Both of the coefficients are prime numbers, and the variable appears in only one of the terms. The expression ...

  cannot be factored

7 0
2 years ago
Other questions:
  • What is the area of this shape? Explain why?
    5·1 answer
  • If I have ten apples and 9 of games how would it take to have 9 apple
    15·1 answer
  • Which line is a graph of the equation: 2x + 5y = -10?
    11·1 answer
  • Which of the following is the parent function of all absolute value functions?
    8·1 answer
  • Which statements are true about the ordered pair (-3,1) in the system of equations {x-4y=6 {3x+y=-8 select each correct answer
    10·2 answers
  • Help me please!!!!!!!
    9·1 answer
  • CAN SOMEONE PLZ HELP MEI BEG U ILL DO ANYTHING JUST HELP ME!!!!
    9·1 answer
  • Plssss help meee I need help
    7·1 answer
  • Several legos are in a bin. You pick a lego at random. Without putting the lego back, you draw a second one. What is the probabi
    12·1 answer
  • Which expression represents the algebraic phrase ""nine times a number plus thirteen""? 9 minus y 13 9 y minus 13 9y 13 13y 9.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!