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
12345 [234]
3 years ago
13

What answer to 10 + a - 5 + 2a

Mathematics
1 answer:
Tanzania [10]3 years ago
5 0

Answer:

5+3a

Step-by-step explanation:

10 + a -5 + 2a

5+a+2a

5+3a

You might be interested in
State whether each of the following represents a function
quester [9]
Need information to answer
8 0
2 years ago
A paper describes a study in which researchers observed wait times in coffee shops in Boston. Both wait time and gender of the c
kvasek [131]

Answer:

t=\frac{85.8-113.4}{\sqrt{\frac{(50)^2}{145}+\frac{(75)^2}{141}}}}=-3.65  

p_v =2*P(t_{(284)}

Using Excel we can use the following code: "=2*T.DIST(-3.65;284;TRUE)"

So the p value is a very low value and using any significance level giveen \alpha=0.05 always p_v so we can conclude that we have enough evidence to reject the null hypothesis, and there is enough evidence to conclude that the means are different.

Step-by-step explanation:

1) Data given and notation

\bar X_{M}=85.8 represent the mean for the males

\bar X_{F}=113.4 represent the mean for females

s_{M}=50 represent the sample standard deviation for males

s_{F}=75 represent the sample standard deviation for female

n_{M}=145 sample size for the group poisoned

n_{F}=141 sample size for the group unpoisoned

t would represent the statistic (variable of interest)

2) Concepts and formulas to use

We need to conduct a hypothesis in order to check if the mean for the two groups are equal or not , the system of hypothesis would be:

Null hypothesis:\mu_{M} = \mu_{F}

Alternative hypothesis:\mu_{M} \neq \mu_{F}

If we analyze the size for the samples both are higher than 30 but the population deviations are not given, so for this case is better apply a t test to compare means, and the statistic is given by:

t=\frac{\bar X_{M}-\bar X_{F}}{\sqrt{\frac{s^2_{M}}{n_{M}}+\frac{s^2_{F}}{n_{F}}}} (1)

t-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.

3) Calculate the statistic

We can replace in formula (1) the results obtained like this:

t=\frac{85.8-113.4}{\sqrt{\frac{(50)^2}{145}+\frac{(75)^2}{141}}}}=-3.65  

4) Statistical decision

The first step is calculate the degrees of freedom, on this case:

df=n_{M}+n_{F}-2=145+141-2=284

Since is a two tailed test the p value would be:

p_v =2*P(t_{(284)}

Using Excel we can use the following code: "=2*T.DIST(-3.65;284;TRUE)"

So the p value is a very low value and using any significance level giveen \alpha=0.05 always p_v so we can conclude that we have enough evidence to reject the null hypothesis, and there is enough evidence to conclude that the means are different.

4 0
3 years ago
Find the indicated side of the<br> triangle.<br> 7<br> 30°<br> b<br> a = [?]
nirvana33 [79]

Answer:

14

Step-by-step explanation:

you have opposite but need to find hypotenuse so you use SOH (sine=opposite/hypotenuse)

so sin(30)= 7/a

7/sin(30)=14

Hope its right

5 0
3 years ago
3,969 + b^2 = 11,025
ludmilkaskok [199]

Answer:

b=84

Step-by-step explanation:

from your equation, subtract 3969 from each side

you are left with b^2=7056

sqrt b^2 = sqrt 7056

b=84

7 0
3 years ago
Read 2 more answers
Find the distance between the two points.<br> (-1, -3), (1, 3)
allsm [11]

Answer:

d = 6.324555

Step-by-step explanation:

d=√1−(−1))^2+(3−(−3))^2

d=√(2)^2+(6)^2

d=√4+36

d=√40

d=6.324555

D=Distance*

4 0
3 years ago
Read 2 more answers
Other questions:
  • Help me answer the question.
    5·1 answer
  • The vertex of this parabola is at (5, 5). when the x-value is 6, they-value is -1. what is the coefficient of the squared expres
    13·2 answers
  • Write an equation of the line in slope-intercept form f(0)=2,f(2)=4
    5·1 answer
  • A number increased by 15 is 114<br>​
    6·2 answers
  • A publisher reports that 26% of their readers own a laptop. A marketing executive wants to test the claim that the percentage is
    8·1 answer
  • Kyle makes his own breakfast every Saturday. It usually takes ten minutes to make the breakfast and five minutes to eat the brea
    14·1 answer
  • The chord BC is a diameter of o​
    11·1 answer
  • Write the slope-intercept form of the equation of the line through the given points
    5·1 answer
  • Albert claims that −6 is the greatest integer solution of the inequality 3x−1≤35+9x. Solve the inequality to show if Albert is c
    9·1 answer
  • Prove step by step that 5^20-5^19 is an even number with out using a calculator Please can you tell me the steps and why?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!