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
wel
3 years ago
15

A researcher studying public opinion of proposed Social Security changes obtains a simple random sample of 50 adult Americans an

d asks them whether or not they support the proposed changes. To say that the distribution of the sample proportion of adults who respond yes, is approximately normal, how many more adult Americans does the researcher need to sample in the following cases? (a) 20% of all adult Americans support the changes (b) 25% of all adult Americans support the changes​
Mathematics
1 answer:
Verizon [17]3 years ago
6 0

Answer:

B

Step-by-step explanation:

You might be interested in
Please help! 90 x 120 = ? divided by 2
Anna007 [38]

90 x 120 = 10800

10800/2 = 5400

6 0
2 years ago
Read 2 more answers
Which values are possible rational roots of 4x3+9x2−x+10=0 according to the rational root theorem? Select each correct answer. ±
chubhunter [2.5K]

Answer:

±2

Step-by-step explanation:

For simplicity let's take a look at a general third order polynomial:

ax^3 + bx^2 + cx + d.  In this particular case,

rational roots have the form ±d/±a.  Note that these are fractions/ratios.  Beyond that, we factor d and choose numerators ±(all possible whole number factors of d, dividing these results by all possible factors of a.

Looking at 4x^3 + 9x^2 - x + 10 = 0, we see that d = 10 and that factors of d include ±1, ±2, ±5 and ±10.  a = 4 and factors of a include ±1, ±2, ±4.

So, any rational roots of the given polynomial will stem from the possible rational roots

±1    ±2    ±5    ±10    ±1    ±2    ±5    ±10

--- , ----- , -----, ------- , ---- , ----- , --- , ------ , and so on,

±1    ±1     ±1      ±1      ±2    ±2   ±2     ±2

until you have used up all of the possible factors of 10 and all of the possible factors of 4.  

Of the four possible rational roots you have shared, only ±2 (which would actually be ±2 / ±1) is acceptable.

4 0
3 years ago
Read 2 more answers
Solve the system by substitution.
kumpel [21]

Answer:

(-5,1)

Step-by-step explanation:

   

y= 13.5+2.5x

-13.5 -13.5

-13.5= 2.5x

x= -5.4

3 0
3 years ago
A cube with a side length of 1008 units is dropped and completely submerged in a cube-shaped container. If the water level in th
Anni [7]

Answer:

The length of a side of the cube-shaped container is 2,016 units

Step-by-step explanation:

step 1

Find the volume of a cube with a side length of 1008 units

The volume of a cube is equal to

V=b^3

where

b is the length side of the cube

we have

b=1,008\ units

substitute

V=(1,008)^3\ units^3

step 2

Find the length side of the cube-shaped container  

Let    

x-----> the length side of the cube-shaped container in units

we know that

The area of the base of the cube-shaped container multiplied by 252 units must be equal to the volume of the cube with a side length of 1008 units

so

x^{2} (252)=(1,008)^3

solve for x

x^{2} =\frac{(1,008)^3}{252}

x^2=4,064,256

x=\sqrt{4,064,256}

x=2,016\ units

therefore

The length of a side of the cube-shaped container is 2,016 units

5 0
3 years ago
Use the expansion of (4+x)3 to find the exact value of (4.02)3
kogti [31]
(4+x)3 = 4 ×3 + x×3
If x = 0.02 then (4+.02)3 = 4×3 + .02×3
= 12 + .06 = 12.06
3 0
3 years ago
Other questions:
  • Help meeeee_ 3+4x+7= what
    15·2 answers
  • If the legs of a trapezoid are congruent, what can be said about the trapezoid?
    9·2 answers
  • A number x plus 10 is more than 2
    5·1 answer
  • Need help on this question writing linear equations
    7·1 answer
  • Three instructors are comparing scores on their finals; each had 99 students. In Class A, one student got 1 point, another got 9
    12·1 answer
  • Luis rolled a number cube 60 times. He rolled the number 6 four times. Which is most likely the cause of the discrepancy between
    10·3 answers
  • Leola ran in a 10 kilometer race about how many miles did she run?
    15·1 answer
  • Hey there! Can you please help me with 6th grade :-)
    6·1 answer
  • -9 - (-4) = <br> What does that equal to?
    12·1 answer
  • A rectangle is divided into five triangles as shown. Noa h sa ys that the area of triangle A ls half the area of triangle B. Do
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!