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exis [7]
3 years ago
8

A study conducted in July 2015 examines smartphone ownership by US adults. A random sample of people were surveyed, and the stud

y shows that of the men own a smartphone and of the women own a smartphone. We want to test whether the survey results provide evidence of a difference in the proportion owning a smartphone between men and women
Mathematics
1 answer:
blsea [12.9K]3 years ago
6 0

Answer:

Step-by-step explanation:

Im sorry i dont really know ur anwer.  Hope someone else can

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Select the correct answer.
malfutka [58]
Answer is the second f
5 0
3 years ago
Write two expressions where the solution is 28
konstantin123 [22]
10+18=28
17+11=28

OR

2x=28 where x=14
4x where x=7
8 0
3 years ago
The differential equation of a certain system is 20⁢y′⁢′+c⁢y′+80⁢y=0
Sholpan [36]

Answer:

c=80

Step-by-step explanation:

Based on my reading the critical damping occurs when the discriminant of the quadratic characteristic equation is 0.

So let's see that characteristic equation:

20⁢r^2+c⁢r+80⁢=0

The discriminant can be found by calculating b^2-4aC of ar^2+br+C=0.

a=20

b=c

C=80

c^2-4(20)(80)

We want this to be 0.

c^2-4(20)(80)=0

Simplify:

c^2-6400=0

Add 6400 on both sides:

c^2=6400

Take square root of both sides:

c=80 or c=-80

Based on further reading damping equations in form

a⁢y′⁢′+b⁢y′+C⁢y=0

should have positive coefficients with b also having the possibility of being zero.

5 0
3 years ago
Andrea has 18 yards of fabric. How many 4-inch pieces can she cut from her original piece?
Mrac [35]

Answer:

162 pieces

Step-by-step explanation:

Andrea has 18 yards

How many 4 inch pieces can she get?

Convert

1 yard = 3 feet

18 yards = 54 feet

1 foot = 12 inches

54 feet = 648 inches

Divide

648 inches ÷ 4 inches =  162 pieces

Hope this helps :)

6 0
3 years ago
Read 2 more answers
Write one hundred twenty-three and fourteen thousandths as a decimal number.
DochEvi [55]

Answer:

.12314

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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