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
d1i1m1o1n [39]
1 year ago
9

Simplify the expression

Mathematics
1 answer:
Nat2105 [25]1 year ago
7 0

Answer:

8x - 4y

Step-by-step explanation:

<u>First: </u><u>solve the parentheses</u>

8x - 7y - (3-6y)

<u>Second:</u><u> combine like terms (terms that both have y or x, or other variable)</u>

8x - 7y - (-3y)

<u>Third:</u><u> there are no more like terms, so you are left with this as your answer</u>

8x - 4y

You might be interested in
A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained p
Alekssandra [29.7K]

Using the z-distribution and the formula for the margin of error, it is found that:

a) A sample size of 54 is needed.

b) A sample size of 752 is needed.

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of \alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which z is the z-score that has a p-value of \frac{1+\alpha}{2}.

The margin of error is of:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

90% confidence level, hence\alpha = 0.9, z is the value of Z that has a p-value of \frac{1+0.9}{2} = 0.95, so z = 1.645.

Item a:

The estimate is \pi = 0.213 - 0.195 = 0.018.

The sample size is <u>n for which M = 0.03</u>, hence:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.03 = 1.645\sqrt{\frac{0.018(0.982)}{n}}

0.03\sqrt{n} = 1.645\sqrt{0.018(0.982)}

\sqrt{n} = \frac{1.645\sqrt{0.018(0.982)}}{0.03}

(\sqrt{n})^2 = \left(\frac{1.645\sqrt{0.018(0.982)}}{0.03}\right)^2

n = 53.1

Rounding up, a sample size of 54 is needed.

Item b:

No prior estimate, hence \pi = 0.05

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.03 = 1.645\sqrt{\frac{0.5(0.5)}{n}}

0.03\sqrt{n} = 1.645\sqrt{0.5(0.5)}

\sqrt{n} = \frac{1.645\sqrt{0.5(0.5)}}{0.03}

(\sqrt{n})^2 = \left(\frac{1.645\sqrt{0.5(0.5)}}{0.03}\right)^2

n = 751.7

Rounding up, a sample of 752 should be taken.

A similar problem is given at brainly.com/question/25694087

5 0
2 years ago
In which pair of numbers is the first number a multiple of the second number?
Sedaia [141]

Answer:

27,9

Step-by-step explanation:

9x3=27

5 0
3 years ago
a High School athletic department bought 40 soccer uniforms at the cost of $3,000. After soccer season, they return some of the
zlopas [31]
$2,960 each. because $3,000- $40=2,960
7 0
3 years ago
Cant seem to solve this problem, help needed.
Georgia [21]

Answer:

c

Step-by-step explanation:

3 0
3 years ago
What is the value of y?<br><br> Enter your answer in the box.
8090 [49]

Answer:64

Step-by-step explanation:

Add 79 with 37 an you will get 116 you need to know the total angle for a triangle is 180 so 180 minus 116 is 64

6 0
3 years ago
Read 2 more answers
Other questions:
  • Danielle drives from her home to the store at an average speed of 40 miles per hour. She returns home along the same route at an
    13·1 answer
  • pens are on sale for $0.79 each. Tamira is going to buy as many pens as she can for $13.50 for the upcoming school year. how man
    15·2 answers
  • What is the answer to - 1/3 (x+6)=0
    7·2 answers
  • Janet wants to solve the equation above, what should she multiply by both sides of this equation by
    12·2 answers
  • In a Match 6 Lotto, winning the jackpot requires that you select six different numbers from 1 to 49, and that the same six numbe
    9·1 answer
  • Name the ordered pair of the origin.
    13·2 answers
  • Last week you worked 24 hours, and earned $240.
    14·2 answers
  • Whoever answers correctly gets brainliest.
    8·1 answer
  • Plz help. Will give brainliest,
    10·2 answers
  • A company tests the life of its rechargeable batteries over six months of use. They test how long a battery will last after a fu
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!