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Darina [25.2K]
3 years ago
6

20. Solve the equation. Show your work. 45 = 3b + 69

Mathematics
1 answer:
valkas [14]3 years ago
8 0
1. 3b + 69 = 45
2. 3b = 45 - 69
3. 3b = -24
4. 3b/3 = -24
5. b = -24/3
6. b = -8
answer is b = -8
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Washington (CNN) About three-quarters of Americans (77%) approve of President Donald Trump's decision to meet with North Korean
snow_tiger [21]

Answer:

b. The margin of error would decrease.

Step-by-step explanation:

Margin of error of a confidence interval:

The margin of error of a confidence interval has the following format:

M = z\frac{\sigma}{\sqrt{n}}

In which z is related to the confidence level, \sigma is the standard deviation of the population and n is the size of the sample.

This means that the margin of error is inversely proportional to the size of the sample, which means that if the sample size increases, the margin of error decreases.

In this question, the sample size is increased, leading to a smaller margin of error. So the correct answer is given by option b.

8 0
2 years ago
Use a property of equality to solve this equation:<br><br> 4.5x = 18<br><br> x =
liberstina [14]

Answer:

4

Step-by-step explanation:

x= 18÷4.5=4

hope it helps

4 0
2 years ago
Read 2 more answers
Which one should i pick?
Airida [17]

last one is the solution u should choose

7 0
3 years ago
Read 2 more answers
Miguel is a golfer, and he plays on the same course each week. The following table shows the probability distribution for his sc
aivan3 [116]

1) 4.55

2) Short hit

Step-by-step explanation:

1)

The table containing the score and the relative probability of each score is:

Score 3 4 5 6 7

Probability 0.15 0.40 0.25 0.15 0.05

Here we call

X = Miguel's score on the Water Hole

The expected value of a certain variable X is given by:

E(X)=\sum x_i p_i

where

x_i are all the possible values that the variable X can take

p_i is the probability that X=x_i

Therefore in this problem, the expected value of MIguel's score is given by:

E(X)=3\cdot 0.15 + 4\cdot 0.40 + 5\cdot 0.25 + 6\cdot 0.15 + 7\cdot 0.05=4.55

2)

In this problem, we call:

X = Miguel's score on the Water Hole

Here we have that:

- If the long hit is successfull, the expected value of X is

E(X)=4.2

- Instead, if the long hit fails, the expected value of X is

E(X)=5.4

Here we also know that the probability of a successfull long hit is

p(L)=0.4

Which means that the probabilty of an unsuccessfull long hit is

p(L^c)=1-p(L)=1-0.4=0.6

Therefore, the expected value of X if Miguel chooses the long hit approach is:

E(X)=p(L)\cdot 4.2 + p(L^C)\cdot 5.4 = 0.4\cdot 4.2 + 0.6\cdot 5.4 =4.92

In part 1) of the problem, we saw that the expected value for the short hit was instead

E(X)=4.55

Since the expected value for X is lower (=better) for the short hit approach, we can say that the short hit approach is better.

8 0
3 years ago
Brainliest to correct help plz
Nastasia [14]

Answer:

-68 1/5

Step-by-step explanation:

Brainliest?

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2 years ago
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