All categories

3 years ago

Evaluate the expression 2x+3 if x= 3

Mathematics

2 answers:

ikadub [295]3 years ago

6 0

Answer:

Step-by-step explanation:

2(x=3)+3

6+3

It is nine

Citrus2011 [14]3 years ago

4 0

let the value be a

2x+3=a

2(3)+3=a

6+3=a

9=a

You might be interested in

What is the value of a? what is the value of b?

vazorg [7]

Answer:

b=18, a=9√3

Step-by-step explanation:

30-60-90 rule

5 0

3 years ago

Read 2 more answers

Write an equation to represent the following statement.

vodka [1.7K]

Equation: j/9 = 5
Answer: j = 45

5 0

3 years ago

What would be 30 +40

Nataliya [291]

Answer:

Step-by-step explanation:

30 + 40 = 70

7 0

3 years ago

Read 2 more answers

PLZZZ HELP DUE IN 10 minutes

Kobotan [32]

Number 2 is right triangle cuz is less than 90

3 0

3 years ago

A confidence interval was used to estimate the proportion of statistics students that are female. A random sample of 72 statisti

jeyben [28]

Answer:

We need a sample of size at least 13.

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 $1 - \frac{\alpha}{2}$ .

The margin of error is:

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

90% confidence interval: (0.438, 0.642).

The proportion estimate is the halfway point of these two bounds. So

$\pi = \frac{0.438 + 0.642}{2} = 0.54$

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 $Z = 1.96$ .

Using the information above, what size sample would be necessary if we wanted to estimate the true proportion to within ±0.08 using 95% confidence?

We need a sample of size at least n.

n is found when M = 0.08. So

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

$0.08 = 1.96\sqrt{\frac{0.54*0.46}{n}}$