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2 years ago

Help pls i need this done asap ty

Mathematics

2 answers:

zhuklara [117]2 years ago

6 0

Answer:

b) 7.89*10^4

c) 3.15*10^3

Step-by-step explanation:

2-42)

the coefficient in scientific notation (the number that is not 10^x) has to be greater or equal to 1 and less than 10. so c and b are incorrect.

b) 0.789*10^5

c) 31.5*10^2

b) 0.789*10^5

in order to make 0.789 greater than 1, I would just multiply it by 10. shown below

=0.789*10*10*10*10*10

=7.89*10*10*10*10

=7.89*10^4

c) 31.5*10^2

same concept but this time divide by 10 to make 3.15 which will add another *10 to the exponent

=31.5*10*10

=3.15*10*10*10

=3.15*10^3

denpristay [2]2 years ago

3 0

Answer:

Step-by-step explanation:

I forgot

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Solve the rational equation 4/x=3x+2/x^2, and check for extraneous solutions.

Aleks [24]

Answer:

x = 2 is a solution

x = 0 is an extraneous solution

(Option 2)

Step-by-step explanation:

4/x = (3x + 2)/x²

4x² = 3x² + 2x

x² - 2x = 0

x(x - 2) = 0

x = 0, x = 2

Verification:

4/x = (3x + 2)/x²

At x = 2

4/2 = [3(2) + 2]/2²

2 = 8/4

2 = 2

At x = 0

4/0 = [3(0) + 2]/0²

Is undefined

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3 years ago

It is solving multi-step inequalities.

kati45 [8]

If you took a better picture I would be able to solve it. Sorry it is pretty blury

3 0

2 years ago

Read 2 more answers

PLEASE ANSWER FAST!!!!! Word problem ideas for 4x+10 2(x-6)

RUDIKE [14]

Step-by-step explanation:

Simplify 2(x-6)

2x+2•-6

2x-12

4x+10=2(×-6)=2x-12

7 0

2 years ago

Help what does 2 1⁄3 ÷ 1 1⁄2 =

azamat

Answer:

$1\frac{5}{9}$

Step-by-step explanation:

This is the answer because:

1) Reduce the expression, if possible, by cancelling the common factors.

2) You can also find the reciprocal of 1 1/2 = 3/2 while dividing the expression:

1. Convert both fractions into improper fractions:

$2\frac{1}{3} = \frac{7}{3}$

$1\frac{1}{2} = \frac{3}{2}$

2. Divide both fractions:

$\frac{7}{3}$ ÷ $\frac{3}{2}$ = $\frac{7}{3}$ x $\frac{2}{3}$ = $\frac{14}{9}$ = $1\frac{5}{9}$

Therefore, the answer is $1\frac{5}{9}$

Hope this helps! :D

4 0

2 years ago

for a class project, a political science student at a large university wants to estimate the percent of students that are regist

nekit [7.7K]

Answer:

90% confidence interval for the true percent of students that are registered voters is [0.56 , 0.64].

Step-by-step explanation:

We are given that for a class project, a political science student at a large university wants to estimate the percent of students that are registered voters.

He surveys 500 students and finds that 300 are registered voters.

Firstly, the pivotal quantity for 90% confidence interval for the true proportion is given by;

P.Q. = $\frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ ~ N(0,1)

where, $\hat p$ = sample proportion of students who are registered voters = $\frac{300}{500}$ = 0.60

n = sample of students = 500

p = true percent of students

Here for constructing 90% confidence interval we have used One-sample z proportion test statistics.

So, 90% confidence interval for the true proportion, p is ;

P(-1.6449 < N(0,1) < 1.6449) = 0.90 {As the critical value of z at 5%

level of significance are -1.6449 & 1.6449}

P(-1.6449 < $\frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ < 1.6449) = 0.90

P( $-1.6449 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ < ${\hat p-p}$ < $1.6449 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ ) = 0.90

P( $\hat p-1.6449 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ < p < $\hat p+1.6449 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ ) = 0.90

90% confidence interval for p =[ $\hat p-1.6449 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ , $\hat p+1.6449 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ ]

= [ $0.60-1.6449 \times {\sqrt{\frac{0.60(1-0.60)}{500} } }$ , $0.60+1.6449 \times {\sqrt{\frac{0.60(1-0.60)}{500} } }$ ]

= [0.56 , 0.64]

Therefore, 90% confidence interval for the true percent of students that are registered voters is [0.56 , 0.64].

Interpretation of the above confidence interval is that we are 90% confident that the true percent of students that are registered voters will lie between 0.56 and 0.64.

6 0

3 years ago