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
Iteru [2.4K]
3 years ago
14

There were 39 balloons at the beginning of a party by the end of the party k of them had popped using k write an expression for

the number of balloons that were left
Mathematics
1 answer:
nadezda [96]3 years ago
6 0
If (x) was the variable for balloons left not popped then
39-k=x
You might be interested in
Franchise Business Review stated over 50% of all food franchises earn a profit of less than $50,000 a year. In a sample of 130 c
nydimaria [60]

Answer:

We need a sample size of 564.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

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

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

\pi = \frac{81}{130} = 0.6231

The margin of error is:

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

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Based upon a 95% confidence interval with a desired margin of error of .04, determine a sample size for restaurants that earn less than $50,000 last year.

We need a sample size of n

n is found when M = 0.04

So

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

0.04 = 1.96\sqrt{\frac{0.6231*0.3769}{n}}

0.04\sqrt{n} = 1.96\sqrt{0.6231*0.3769}

\sqrt{n} = \frac{1.96\sqrt{0.6231*0.3769}}{0.04}

(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.6231*0.3769}}{0.04})^{2}

n = 563.8

Rounding up

We need a sample size of 564.

4 0
3 years ago
Your class is learning to tie knots. Each student needs a piece of rope that is 38 yard long. How many yards of rope are needed
djyliett [7]
38 yard piece for each student and there are 16 students:

38*16=608

608 yards needed for your class
6 0
3 years ago
Read 2 more answers
The Magic Dragon has 2013 heads. Leo the Brave is cutting off the Dragon's heads at a speed of 5 heads per minute. The Dragon's
aivan3 [116]

Answer:  The answer is 1833 heads  and 11 hours, 11 minutes.


Step-by-step explanation:  Given that the Magic Dragon has 2013 heads. The brave Leo is cutting off the Dragon's heads at a speed of 5 heads per minute. But, the Dragon's heads are growing back at a speed of 2 heads per minute.

So, the number of heads of Dragon that are decreasing per minute = 3.

Therefore, after 1 hour, i.e., 60 minutes, The number of heads of the Dragon

= 2013 - 60 × 3 = 2013 - 180 = 1833 heads.

Now, the fight will last until all the heads of the Dragon are cut. Let the fight lasts for 'x' minutes, then

2013-x\times 3=0\\\\\Rightarrow 3x=2013\\\\\Rightarrow x=\dfrac{2013}{3}=671.

Hence the fight lasts for 671 minutes, i.e., 11 hours and 11 minutes.

Thus, the Dragon will have 1833 heads after 1 hour and the fight will last for 11 hour and 11 minutes.


3 0
3 years ago
Which inequality best represents the graph?
ale4655 [162]

Answer:

A   y ≥ (1/2)x + 5

Step-by-step explanation:

The shaded area is above the solid line

the correct symbol is ≥

7 0
2 years ago
I don't understand what the question is asking?
lana66690 [7]
OK for this question you need to find out how many more post are needed. If you look at the diagram it shows that one side is 50 feet.  Now there are two sides that will need post, because the barn side need no more.  Now if there are two side both 50 feet, and you need a post every ten feet. How many posts are needed? 

5 0
3 years ago
Read 2 more answers
Other questions:
  • A shirt costs $7.97 including tax, and
    9·2 answers
  • Real populations sometimes increase beyond their environment’s carrying capacity in a relatively short period of time. What is t
    11·1 answer
  • a butcher has 10 3/4 pounds of ground beef that will be priced at $3.40 per pound. He divides the meat into 8 equal packages. To
    9·1 answer
  • Prime factorization of 55
    5·2 answers
  • What is the product? x^2-16/2x+8 multiplied by x^3-2x^2+x/x^2+3x-4
    11·2 answers
  • Give me the answer for this
    12·1 answer
  • Anybody know the answer?
    7·1 answer
  • Which figure is described below?
    7·1 answer
  • Hey, can you help me please and thank you
    11·2 answers
  • The width of a rectangle room is 80 percent of its length. WHat is the area of the room?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!