All categories

4 years ago

Please help me on these two questions

Mathematics

2 answers:

iragen [17]4 years ago

6 0

Answer:

Question 8.) Choice d.) 4 + x + 6x = 4 + 7x

Question 9.) Choice b.) 18 - 15 + 4n + 5n simplifies to 9n + 3

Step-by-step explanation:

For the first question, like terms are terms that have the same variables, and not necessarily the same coefficient numbers.

first problem, x + y + xy all have unique terms. x is different from y and is different from xy

so it cannot be A.

Choice d. has like terms x and 6x so 4 + x + 6x can simplify to 4 + 7x

Choice b.) 18 - 15 + 4n + 5n simplifies to 9n + 3

irina [24]4 years ago

3 0

Answer:A for the first one and C for the second one

Step-by-step explanation:

You might be interested in

#FleePointsForFlee Thank you everyone who posted this, so generous! Quickly answer, though! Gonna be gone within minutes (maybe)

Ksju [112]

Answer:

hey, thanks for the points

3 0

3 years ago

Read 2 more answers

What is the lateral surface area?

Luda [366]

Answer:

56.556 square inches

Step-by-step explanation:

Surface area of an open cylindrical pipe is = πdh

3.142 × 1 × 18 = 56.556

8 0

3 years ago

In the past decades there have been intensive antismoking campaigns sponsored by both federal and private agencies. In one study

DIA [1.3K]

Answer:

$z=\frac{0.384-0.362}{\sqrt{0.374(1-0.374)(\frac{1}{4276}+\frac{1}{3908})}}=2.055$

The p value can be calculated from the alternative hypothesis with this probability:

$p_v =2*P(Z>2.055)=0.0399$

And the best option for this case would be:

C. between 0.01 and 0.05.

Step-by-step explanation:

Information provided

$X_{1}=1642$ represent the number of smokers from the sample in 1995

$X_{2}=1415$ represent the number of smokers from the sample in 2010

$n_{1}=4276$ sample from 1995

$n_{2}=3908$ sample from 2010

$p_{1}=\frac{1642}{4276}=0.384$ represent the proportion of smokers from the sample in 1995

$p_{2}=\frac{1415}{3908}=0.362$ represent the proportion of smokers from the sample in 2010

$\hat p$ represent the pooled estimate of p

z would represent the statistic

$p_v$ represent the value for the pvalue

System of hypothesis

We want to test the equality of the proportion of smokers and the system of hypothesis are:

Null hypothesis: $p_{1} = p_{2}$

Alternative hypothesis: $p_{1} \neq p_{2}$

The statistic is given by:

$z=\frac{p_{1}-p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{2}})}}$ (1)

Where $\hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{1642+1415}{4276+3908}=0.374$

Replacing the info given we got:

$z=\frac{0.384-0.362}{\sqrt{0.374(1-0.374)(\frac{1}{4276}+\frac{1}{3908})}}=2.055$

The p value can be calculated from the alternative hypothesis with this probability:

$p_v =2*P(Z>2.055)=0.0399$

And the best option for this case would be:

C. between 0.01 and 0.05.

7 0

3 years ago

25x=2544 what does x represent

Georgia [21]

Hey there!

Firstly, we are going to divide by $25$ on each of your sides because it paired off with a variable

Here's what I meant!

$\frac{25x}{25} = \frac{2,544}{25}$

We would have to cancel out the: $\frac{25x}{25}$ because it gives us $1$

Answer: $x = \frac{2,544}{25}$

Good luck on your assignment and enjoy your day!

~LoveYourselfFirst:)

5 0

3 years ago

Add (4x+4)+(5b+3) simplify your Answer. Help

yarga [219]

Answer:

5+4+7

Step-by-step explanation:

I think

5 0

3 years ago

Read 2 more answers