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2 years ago

PLEASE HELP PLEASE!!!!!!!!!!! BRAINLIEST AND WHATEVER YOU WANT! THIS IS DUE RIGHT NOW

Mathematics

2 answers:

baherus [9]2 years ago

7 0

The answer would be A because 2 to the third power is 2000 and if your write 2000 3 times then you would have 9 zeros in total

Vedmedyk [2.9K]2 years ago

4 0

Answer:

thx for the free points since you posted this last week :)

Step-by-step explanation:

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What is the completely factored form of this expression?

Eddi Din [679]

Answer:

(3x + 4)(x − 7)

Step-by-step explanation:

If you multiply.

3x2-21x+4x-28

3X2-17x-28

8 0

3 years ago

Find the solution(s) to the system of equations. Select all that apply.<br> y=x² - 4<br> y = -x-2

Andrej [43]

Answer:

x=1, y= -3

x= -2 y=0

Step-by-step explanation:

5 0

3 years ago

You are planning a survey of starting salaries for recent computer science majors. In a recent survey by the National Associatio

nydimaria [60]

Answer:

A sample size of 554 is needed.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error M as such

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

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

Standard deviation is known to be $12,000

This means that $\sigma = 12000$

What sample size do you need to have a margin of error equal to $1000, with 95% confidence?

This is n for which M = 1000. So

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

$1000 = 1.96\frac{12000}{\sqrt{n}}$

$1000\sqrt{n} = 1.96*12$

Dividing both sides by 1000:

$\sqrt{n} = 1.96*12$

$(\sqrt{n})^2 = (1.96*12)^2$

$n = 553.2$

Rounding up:

A sample size of 554 is needed.

5 0

2 years ago

You can rent a ski boat for $20 plus $35 per hour. If you want to spend no more than $150, how many hours can you rent a ski boa

elena-s [515]

Answer:

h ≤ (approx) 3.7

Step-by-step explanation:

To start, we can take our knowledge that we have to spend 20$, at minimum. Therefore, we can only allocate (150-20)=130 to our payment per hour. As we pay 35$ per hour, the amount of money relative to hours would be 35*h. Therefore, as we can allocate 130 dollars or less for our hourly payments, and our money is 35*h, we can day that 35*h(the money we spend on hourly rates) ≤ 130. Then, as 35*h ≤ 130, we can divide 35 from both sides to get h ≤ 130/35, or h ≤ (approx) 3.7

3 0

3 years ago

Mateo started with more

NemiM [27]

Answer:

y > 75

Step-by-step explanation:

Given that:

Starting number of boxes = > 100

Number of boxes sold = 25

Number of boxes left after selling 25

Let the number of boxes left = y

y = starting number of boxes - Numbe rof boxes sold

y = 100 - 25

y = 75

Since the starting number of boxes is more than 100

Then, y should also be more than 75

y > 75

4 0

3 years ago