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3 years ago

Please helpppppppppp

Mathematics

2 answers:

Lostsunrise [7]3 years ago

8 0

Answer:

see picture above shown

BigorU [14]3 years ago

6 0

Answer:

The answer is -a^2 + 3a +1

Let me know if it's right, this is what I got when I did the problem :)

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Ms. Claudio and Ms. yee took their students to the winter festival. There were a total of 68 students in attendance. In group A

svetlana [45]

Answer: 407.25

Step-by-step explanation:

23 x 6.75 =155.25 25 x 4.50 = 112.50 20 x 6.75+4.50=139.50 112.50+155.25+139.50= 407.25 HOPE IT HELPS!!! : )

7 0

2 years ago

Based on aâ poll, among adults who regret gettingâ tattoos, 18â% say that they were too young when they got their tattoos. Assum

Sergeeva-Olga [200]

Answer:

a) 20.44% probability that none of the selected adults say that they were too young to get tattoos.

b) 35.90% probability that exactly one of the selected adults says that he or she was too young to get tattoos.

c) 56.34% probability that the number of selected adults saying they were too young is 0 or 1.

d) No

Step-by-step explanation:

For each adult, there are only two possible outcomes. Either they say they were too young when they got their tattoos, or they don't say that. Each adult is independent of each other. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

18% say that they were too young when they got their tattoos.

This means that $p = 0.18$

Eight adults who regret getting tattoos are randomly selected

This means that $n = 8$

a. Find the probability that none of the selected adults say that they were too young to get tattoos.

This is P(X = 0).

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 0) = C_{8,0}.(0.18)^{0}.(0.82)^{8} = 0.2044$

20.44% probability that none of the selected adults say that they were too young to get tattoos.

b. Find the probability that exactly one of the selected adults says that he or she was too young to get tattoos.

This is P(X = 1).

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 1) = C_{8,1}.(0.18)^{1}.(0.82)^{7} = 0.3590$

35.90% probability that exactly one of the selected adults says that he or she was too young to get tattoos.

c. Find the probability that the number of selected adults saying they were too young is 0 or 1.

Either a. or b.

20.44 + 35.90 = 56.34

56.34% probability that the number of selected adults saying they were too young is 0 or 1.

d. It we randomly select 9 adults. Is 1 a significantly low number who day that they were too young to get tattoos?

Now $n = 9$

It is significantly low if it is more than 2.5 standard deviations below the mean.

The mean is $E(X) = np = 9*0.18 = 1.62$

The standard deviation is $\sqrt{V(X)} = \sqrt{n*p*(1-p)} = \sqrt{9*0.18*0.82} = 1.15$

1 > (1.62 - 2.5*1.15)

So the answer is no.

5 0

3 years ago

Each leg of an isosceles triangle is 4 meters longer than the base.the perimeter of the triangle is 26meters. Find the lengths o

Natali5045456 [20]

Because the triangle is isosceles, we know that it has 2 equal sides, which are the 2 legs. We can create an equation with the given information:

26 = 2(b + 4) + b

26 = 3b + 8

18 = 3b

b = 6

If the base is 6, add 4 to get 10.

base = 6 meters

leg = 10 meters

other leg = 10 meters

<em>Hope this helps! :)</em>

3 0

3 years ago

A jacket's REGULAR price is $65.00. It is on clearance for 40% off. you have to pay 5% sales tax What is the final price for the

Irina18 [472]

Answer:

circle tttdonuts

Step-by-step explanation:

d crystal

6 0

2 years ago

Consider the triangles.

Aleksandr [31]

Answer:

PRETTY SURE ITS D

Step-by-step explanation:

5 0

3 years ago