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kipiarov [429]
3 years ago
5

Compounds A and B are used in an experiment.

Mathematics
2 answers:
Neko [114]3 years ago
6 0

Can you explain why its 300

xeze [42]3 years ago
5 0
300 is the correct answer
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Please help ill mark brainliest
posledela

Answer:

x = 3

Step-by-step explanation:

since it's hitting 3 on the x axis and just goes up and down where 3 is, all the points have an x of 3 and nothing else. making the equation x = 3

7 0
2 years ago
Factor each. <br><br> 5x to the 3rd ppwer + 25x to the 2nd power -4x -20 = 0
lesya692 [45]
If you are looking forward to adding them together you will get 145.  Just need to know if this questions had options?
4 0
3 years ago
During the 2000 season, the home team won 138 out of 240 regular season National Football League games. (15 points) a) Construct
jeka94

Answer:

Step-by-step explanation:

A) Confidence interval is written as

Sample proportion ± margin of error

Margin of error = z × √pq/n

Where

z represents the z score corresponding to the confidence level

p = sample proportion. It also means probability of success

q = probability of failure

q = 1 - p

p = x/n

Where

n represents the number of samples

x represents the number of success

From the information given,

n = 240

x = 138

p = 138/240 = 0.58

q = 1 - 0.58 = 0.42

To determine the z score, we subtract the confidence level from 100% to get α

α = 1 - 0.95 = 0.05

α/2 = 0.05/2 = 0.025

This is the area in each tail. Since we want the area in the middle, it becomes

1 - 0.025 = 0.975

The z score corresponding to the area on the z table is 1.96. Thus, the z score for a confidence level of 95% is 1.96

Therefore, the 95% confidence interval is

0.58 ± 1.96√(0.58)(0.42)/240

Confidence interval is

0.58 ± 0.062

B) winning more than halve of the games would be winning 120 games and above.

p = 120/240 = 0.5

We would set up the hypothesis test.

For the null hypothesis,

P ≥ 0.5

For the alternative hypothesis,

P < 0.5

Considering the population proportion, probability of success, p = 0.5

q = probability of failure = 1 - p

q = 1 - 0.5 = 0.5

Considering the sample,

Sample proportion, P = x/n

Where

x = number of success = 138

n = number of samples = 240

P = 138/240 = 0.58

We would determine the test statistic which is the z score

z = (P - p)/√pq/n

z = (0.58 - 0.5)/√(0.5 × 0.5)/240 = 2.48

Recall that this is a left tailed test. We would determine the probability value of the area to the right of the z score from the normal distribution table.

P value = 1 - 0.9934 = 0.0066

Since alpha, 0.01 > the p value, 0.0066, then we would reject the null hypothesis.

Therefore, At the 0.01 significance level, there is no strong evidence of a home field advantage (they win more than half of the games) in professional football.

3 0
3 years ago
Steve and Elizabeth decide to become partners in a children’s cooking school. They need $80,000 for the franchise. They invest i
PilotLPTM [1.2K]

Answer:

The share of Steve  is $34,285 .71

The share of Elizabeth  is  $45,714.28

Step-by-step explanation:

The total investment of Steve and Elizabeth in cooking school = $80, 000

The ratio of investment of  Steve and Elizabeth  = 3: 4

Let us assume the common factor in the ratio is m.

So, the ratio of  Steve = 3 m

and the ratio of  Steve = 4 m

So, according to the question:

⇒ 3 m + 4 m   =  80,000

or, 7 m = 80,000

⇒ m = 80,000 / 7 = 11,428.57

or, m = 11,428.57

⇒ The share of Steve = 3 m = 3 x (11,428.57)  = 34,285 .71

⇒ The share of Elizabeth = 4 m = 4 x (11,428.57)  = 45,714.28

4 0
3 years ago
1) Solve the inequality.<br> 8x + 9 &lt; 4x - 3
Nitella [24]

Answer:

x < -3

Step-by-step explanation:

subtract 4x: 4x + 9 < -3

subtract 9: 4x < -12

divide by 4: x < -3

3 0
3 years ago
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