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3 years ago

The sum of twice a number and 9 is -25

Mathematics

1 answer:

Mice21 [21]3 years ago

6 0

2x + 9 = -25

2x = - 34

x = - 17

The number is -17

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What is the probability that a respondent 18-29 years of age thinks that global warming will not pose a serious threat during hi

Stels [109]

Answer:

0.4906 or 49.06%

<em>Missing Information:</em> I have attached the missing table showing the data obtained from the poll taken from respondents

Step-by-step explanation:

Using the data,

the number of people who do not think there will be an impact of global warming during their lifetime = 131

Number of People who think there will be impact = 134

Number of People who are unsure = 2

Total no. of people = 131 +134 +2 = 267

Probability that respondent 18-29 years age thinks global warming won't pose a threat during his/her lifetime = P

Probability = P = $\frac{Number.of.people.who.said.No }{Total.number.of.people}$

Probability = P = $\frac{131}{267}$ = 0.4906 or 49.06 %

3 0

3 years ago

Helpppp pleaseeeeee!!!

astraxan [27]

Answer: yes.

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

A survey of 80 homes in a Washington D.C. suburb showed that 45 were air conditioned. A sample of 120 homes in a Pittsburgh subu

Karo-lina-s [1.5K]

Answer:

There is no significant difference between the two proportions

Step-by-step explanation:

State the hypotheses:

Null hypothesis -> H0: P1 = P2

Alternative hypothesis -> H1: P1 not = P2

Note that hypotheses constitute a two-tailed test. the null hypothesis will be rejected if the proportion from population 1 is too big or if it is too small.

Formulate an analysis plan

For the analysis, the significance level is 0.05. The test method is a two-proportion z-test.

Analyze sample data.

Using sample data we calculate the pooled sample porportion (p) and the standard error (SE). Using those measures, we compute the z-score test statistic (z).

p = (p1*n1 + p2*n2)/(n1 + n2)

p1 = 45/80 = 0.5625

p2 = 63/120 = 0.525

n1 = 80

n2 = 120

p = (0.5625*80 + 0.525*120)/(80 + 120)

p = 0.54

$SE = \sqrt{p*(1-p)*(\frac{1}{n_{1} } +\frac{1}{n_{2}} )}$

$SE = \sqrt{(0.2428)*(0.0125 + 0.0083)}$

SE = 0.07112

z = (p1 - p2)/ SE

z = (0.5625 - 0.525)/0.07112

z = 0.527

For z = 0.527 we have p-value 0.198

Interpret results. Since p - Value (0.198) of the test is greater than the alpha-0.05 (For two tailed test α-0.025). Therefore we cannot reject the null hypothesis.

There is no significant difference between the two proportions

5 0

3 years ago

Answer please and explain

mash [69]

So, the formula for this one is:

C = 2πr
(use 3 for pi again)

so substitute the numbers:

C = 2 x 3 x 2

and the answer is 12

6 0

3 years ago

Write v as a linear combination of u1, u2, and u3, if possible. (If not possible, enter IMPOSSIBLE.) v = (7, −14, −3, −4), u1 =

AlexFokin [52]

Answer:

IMPOSSIBLE

Step-by-step explanation:

8 0

3 years ago